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Specifications/Drawings
   Loco, EMU & Power Supply
      Other important links for Loco
         SMI/MS/TC
            Serial number wise
               Master list of Modification Sheet
                  MS no. 1 to 450


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MS no. 1 to 450


MODIFICATION SHEETS of Electric Locos
 MS no. 1 to 450

 

Sl.No.
MS  No.
                    Description
Date
File No.
1.
Shifting of ammeter shunt from positive side to negative side (SKEL-2171)
23.06.75
EL/3.1.3/J2
2.
Provision of QD Current differential relay type TR-701, SKEL-2173,  2174, 2175. 
5.5.75
EL/3.1.3/J2
3.
Elimination of differential wheel slip relay  QD 14 QD36(SKEL-2180)
5.5.75
EL/3.1.3/J2
4.
Provision of over voltage relay QZD + RQZD.SKEL 2181, 2182, 2183
5.5.75
EL/3.1.3/J2
5.
Mounting of ARNO starter contactor C118 Alosthem make in Ba3 Panel (SKEL-2184)
5.5.75
EL/3.1.3/J2
6.
Mounting of Arno starter  resistance cut out relay QCVAR(AC) (SKEL-2185)
5.5.75
EL/3.1.3/J2
7.
Provision of additional weight transfer compensation relay QWC (SKEL-2187, 2188)
23.6.75
EL/3.1.3/J2
8.
Provision of ZQWC and ZLC Switch
10.9.75
EL/3.1.3/J2
9.
Shifting of panto raising switch ZPT (SKEL-2368)
10.9.75
EL/3.1.3/J2
10.
Diverting the transformer cables to accommodate ATEEX cables (Power cable) (SKEL-2380)
10.9.75
EL/3.1.3/J3
11.
50 mm2 cables instead of 150 mm2 cable for RPS (SKEL-2319)
5.5.75
EL/3.1.3/J3
12.
Modification to QV 64 Relay circuitry and elimination of diode VS-11 (SKEL-2361)
10.9.75
EL/3.1.3/J3
13.
Provision for GR CAM(0-15) in QWC Circuit (SKEL-2188)
23.6.75
EL/3.1.3/J3
14.
Provision for paper gasket for fixing suspension bearing axle cap
15.5.75
EL/3.1.3/J3
15.
Segregation of HT and LT cables in cable trench and provision rubble sealing
10.9.75
EL/3.1.3/J3
16.
Provision of modified steel Tray below tap changer to drain oil (SKEL-2321)
15.5.75
EL/3.1.3/J3
17.
Replacing the present sunvisor by the type used on WAG4 locos.
23.6.75
EL/3.1.3/J3
18.
Cab Ventilators (SKEL-1744)
30.9.72
EL/3.1.3/J3
19.
Elimination of WSMGR switch (SKEL-2317)
05.5.1975
EL/3.1.3/J3
20.
Elimination of QTD 100 Relay and BPQ 100 Switches (SKEL-2305)
5.5.75
EL/3.1.3/J3
21.
Supporting cleat for smoothing reactor (SL) Cables (SKEL-1743)
30.9.72
 
22.
   
Modification to the terminal stud of M/s Jyoti arno converter (SKEL 2047 & 2048)
12.6.74
EL/3.2.11/D5
23.
Modification introduced groove in the main valve guide pin and piston of air blast circuit breaker type DETF 301250
16.12.76
EL/3.1.3/D7
24.
Modification to the size port in the main valve housing of air blast circuit breaker(SKEL-2268)
16.2.76
EL/3.1.3/D7
25.
Roof Modification to prevent water leakage into HT compartment (SKEL 2602)
23.12.76
EL/3.1.3
26.
Provision of a By Pass resistance across QV 61 Relay (SKEL-2633)
23.4.77
EL/3.1.3/E7
27.
Improvement of CCUA Fuse arrangement (SKEL-2634)
23.4.77
EL/3.1.3/E7
28.
Modified terminal block assembly SB-2 TK-1 panel SKEL-2632
 
EL/3.1.3/E7
29.
Modified fixing arrangement for the breather (SKEL-2649)
4.5.77
EL/3.1.3/E7
30.
Modified catch assembly for CGR Arc chute (SKEL-2661)
8.7.77
EL/3.1.3/D7
31.
Modification of traction motor EP line contactor type 3421-25-2M(SKEL-2587)
19.7.77
EL/3.1.3/E7
32.
Support for C118 control cable (SKEL2663)
6.9.77
EL/3.1.3/E7
33.
Modified air connection between RDJ and QPDJ in DJ circuit (SKEL-2354, 2700)
29.8.77
EL/3.1.3/E7
34.
Additional support for oil pipe between MPH conservation tank (SKEL-2702)
3.8.77
EL/3.1.3/D7
35.
Modified support rod for TFLM and QPDJ control cable (SKEL-2710)
29.8.77
EL/3.1.3/E7
36.
Modified support bracket for DJ control cables l(SKEL-2711)
29.8.77
EL/3.1.3/E7
37.
Fastening RGR & CGR support plates on tap changer assembly No.32 (SKEL-2650)
22.8.77
EL/3.1.3/E7
38.
Support for transformer oil pump assembly MPH(SKEL-2717)
29.8.77
EL/3.1.3/E7
39.
Modification to vane type air flow relay M/s Rotomac (SK  EL-2737)
24.11.77
EL/3.1.3/E2
40.
Modification to tap changer circuit double plus operation(SKEL-2746)
28.3.78
EL/3.1.3/A2
41.
QCVR Relay circuit modification(SKEL-2758)
3.3.78
 
42.
Additional rubber sealing for roofs of electric locomotives (SKDL-2932, 2933)
2.12.77
EL/3.1.3/A2
43.
Modification to connecting air line (1922) of SMGR for tap changer No.32 of M/s HBB to avoid air leakage
25.5.78
3.2.30/DC3
44.
Modification to horn check lugs in the trimount bogie frame coasting  Co-Co bogies of electric loco (SKEL-3056)
3.2.78
3.2.13/DC3
45.
Modification to reduce the overhang length of stator winding of compressor motor type K5 1 d2/H supplied by M/s HBB Ltd, Faridabad (SKEL-2664)
28.12.77
EL/3.2.92/D4
46.
Replacement of existing terminal block by epoxy moulded terminal block of  improved design (SKEL-2754, 2784)
16.1.78
EL/3.2.70/D4
47.
Support for oil flow indicator of tap changer No.32 (SKEL-2749)
27.1.78
EL/3.2.30/E2
48.
Taping of Traction motor type  TAO 659 leads to prevent chopping in cleat (SKEL-2785)
13.2.78
EL/3.2.8/J2
49.
Modification (Type-I) to inspection covers of TAO 659 traction  motor (Alternative)
20.2.78
EL/3.2.99/D3
50.
To weld the top surface of the lifting hooks provided at the four corner on transformer BOT 3460, BHEL make to avoid cracks (SKEL-2851)
31.5.78
EL/3.2.
51.
Provision of additional insulated  line between fixed contact assemblies of three phase  electromagnetic  contactors of CLW, Unilec or Alsthom make.
7.6.78
.EL/3.2.8/DC1
52.
Fixing neoprene gasket on the terminal box  cover of motor type TAO-659
18.4.78
EL/3.2.82
53.
Modification to bellows of Traction Motor type TAO 659
23.6.78
.EL/3.2.82/DB1
54.
Provision of taper hole to accommodate the taper pin in the manual drive of tap changer type No.32 of M/s HBB Make (SKEL-2888)
3.6.78
EL/3.2.30/DC2
55.
Modification to the locking arrangement of anchor link fixture (SKEL-2870)
13.7.78
EL/3.2.63/DB2
56.
Modification to increase the thickness of short circuiting ring of compressor motor type 51d2, supplied by M/s Oerlikon Switzerland.
20.7.78
EL/3.2.92/J2
57.
Simplified control card for static battery charger type BCF-6 of M/s Control and  Driver Ltd.
23.8.78
.EL/3.2.12/EC2
58.
Strengthening of rotor on siemens make MVMT  type IRA2 164-2 (SKEL-2762)
10.8.78
EL/3.2.48/D4
59.
Replacement of the air strainer cum check valve unit by oil both type air filter for vacuum brake exhauster of  electric locomotives
26.8.78
.EL/3.2.16/DB2
60.
Shifting of control supply of DC coil of M/s English electric make relays QRS 1/2 QLM, Q30, from CCLS to CCPT  ( SKEL- 2934)
8.8.78
.EL/3.1.3/DA4
61.
Modification to panto  insulator  mounting base.
8.8.1978
.EL/3.1.3/DA3
62.
Modification to the profile of the mobile contact and its mounting arrangement on the mobile contact levers of EP contactor type TCP 3421-25-2m manufactured by CLW (SKEL-3059, 3062)
26.2.79
.EL/3.2.7/DC1
63.
Provision of RC damping unit across 380 V  auxiliary winding (TFWA) of the transformer connected arno converter (SKEL-3088)
3.4.79
EL/3.2.70/EC2
64.
Replacement of existing  3mm2 cable socket CLW Type 18, 19 & 20 by new socket 18A, 19A,20A as per Drg. No. (SKEL-3112)
20.6.79
.EL/2.2.36/DA4
65.
Replacement of L clamp by palm clamp for the cable connection of A0, A1 bushing of indigenous transformer type BOT   3460(SKEL 3116)
May 1979
EL/3.2.1/DC2
66.
Modification to base plate fixing arrangment and terminal connection screw for vane type air flow relay of M/s Rotomac
10.7.79
.EL/3.2.10/2
67.
Nylon insulator support for copper bar no FM 24 in Ba3 panel (SKEL-3150)
9.8.79
.EL/3.1.3/DA4
68.
Shifting of bleeder resistance  (RS) outside the B.C.F.-7 battery charger of M/s Controls drive corporation (SKEL 3151)
10.8.79
.EL/3.2.12/EC2
69.
Provision of current limiting resistor on static battery charger type BCF of M/s Controls & Drives Corporation (SKEL 3151, 2813/A)
10.8.79
EL/3.2.12/EC2
70.
Re soldering of filter capacitor C3 and provision of leatheroid paper in its container and terminal for filter capacitor connection (SKEL-3152)
10.8.79
EL/3.2.12/EC2
71.
Replacement of 3K ohm Carbon resistor R4 by wire wound resistor in BCF7 battery charger of M/s Contract Drives Corporation/ Coimbatore.
10.8.79
EL/3.2.12/EC2
72.
Modification of the flexible cable connection printed card board of BCF-7 battery charger of M/s Contracts Drives Corporation /Coimbatore (SKEL-3153)
10.8.79
EL/3.2.12/EC2
73.
Provision of insulated barrier at rear side of signalling fuse on rectifier panel and WAM4 loco rectifier   of  SKEL-3164
3.8.79
EL/3.2.27
74.
Provision of mid-point earthing of power circuit on WAM4 locomotive with 25-3P Traction motor connection SKEL-3176
3.9.79
EL/3.1.3/
75.
Provision of ducting for safety valve for Tap Changer type N-32 HBB Make
5.2.80
EL/3.2.30/DC2
76.
Modification to servomoter sleeves of circuit breaker type DBTE 30 I 250 HBB make
5.2.80
EL/2.2.2/DC2
77.
Material specification for core supporting stud of transformer type BOT 3460 BHEL made (SKEL-3279)
22.8.80
El/3.2.1.2/JCG
78.
Silicon rectifier blower motor circuit breaker (DMVSI) failure
4.3.80
3.2.146/EC2
79.
Provision of insulation between shade carrier ring and lamp holder sleeve in the existing signal lamp holder
11.3.80
EL/3.2.40/DA3
80.
Modification to ELGI oil pressure switches (QPH) for minimising cracking of backlite body
24.5.80
EL/9.2.39/2
81.
Modification to ELGI oil pressure switches QPH for missing  oil leakage.
24.5.80
EL/8.2.39/2
82.
Modification to ELGI pneumatic pressure switches for minimising diaphragm failure.
24.5.80
EL/3.2.39/2
83.
Modification to protection screen of air outlets of TAO-659 superseded by WAM4/186.
24.4.1980
EL/3.2.82
84.
WAM4/101
Loco head light voltage stabiliser modification (SKEL-3295)
May  1980
EL/2.2.24/1/EC2
85.
Loco head light voltage stabiliser modification
June 1980
EL/2.2.24/1/EC2
86.
Replacement of KAYCEE Programme switches by Siemens make HVSI
5.12.83
EL/3.2.53/2/CG
87.
Silicon rectifier blower motor programme switch (HVSI) failure
23.6.80
EL/3.2.53/ EC2
88.
Silicon rectifier damping capacitor failure
15.7.80
EL3.2.27/ EC2
89.
Increase in output voltage setting of battery chargers type BCF 6 and BCF7
July 1980
EL/3.2.12/EC2
90.
Winding insulation failure on auxiliary motor can be reduced by providing selenium surge suppressor (SKEL-3145/A)
6.11.80
EL/3.2.7/2 EC1
91.
Provision of series resistance of MTDJ coil  (SKEL-3586)
12.12.80
EL/2.2.2/ DC2
92.
Replacement Indigenous of double coil spring by single coil spring of PT AM/2 of M/s Stone Plate Electric India Ltd. (SKEL-3110)
12.12.80
EL/2.2.1/ DC2
93.
Modification to cutler hammer relay (Q-48) for minimising micro switch failure
18.2.81
EL/3.2.10/8
94.
Provision of capacitor across cutler hammer time delay relay coil (Q-48)
14.8.81
EL/3.2.10/8
95.
Mounting arrangement of the capacitor tube connected across cutel hammer relay coil (Q48)
14-8-81
EL/3.1.10/8/JCG
96.
Sanding circuit
12.5.81
EL/3.1.3
97.
Modification to Siemens make programme switches for minimising failure of backlight coaches lever arm
2.7.81
EL/3.2.53/2/ADE-C2
98.
Clamping arrangement for PHGR
9.7.81
EL/3.2.30
99.
Modification to the mobile contact for electromagnet contactor for all locos.
24.7.1981
EL/3.2.8/JCG
100.
Modification to ELGI oil pressure switches for (QPH) diaphragm.
28.7.81
EL/3.2.39/2
101.
Modification to control louver of SMGR of Tap changer No.32 HBB make
28.7.81
EL/3.2.30/JCG
102.
Replacement of flexible contact assembly  by a braidedShunt in TAO-659 Traction motor
28.8.81
EL/3.2.127/TM-L
103.
Modification to head light circuit(WAM4B,WAM4C)
8.9.81
EL/3.1.3/DA2
104.
Shifting of power contact CTFI (4-10) in RF2-5 circuit
27.3.82
EL/3.1.3/ DA2
105.
Provision of mid point earthling of power circuit on WAM4 loco with  3S-2P TM connection
9.3.82
EL/3.1.3/ DA2
106.
Modification for making rheostatic braking and inoperative under motor isolated connection
16.3.82
EL/3.1.3DA2
107.
Provision of supporting clamp for wire wound resistor of QCVAR Relay
Jan 82
EL/3.2.10/5/ C2
108.
Modification to special washer used in transition resistance  assembly of tap changer No.32 HBB Make  (SKEL-3456)
27.3.82
EL/3.2.30/JCG
109.
Modification to earthing connection of A0 bushing of transformer type BOT 3460 & Sheet 3900
3.5.82
EL/3.2.1/2/JCG
110.
Provision of additional  insulation of auto transformer winding leads leading towards tap changer at the anchoring location of cleat  Parmali Works
14.6.82
EL/3.2.1/2
111.
Improving the stiffness of Elgi compressor cooling fan blade by welding stiffening ring on the periphery of fan
Oct.82
EL/3.2.15/ Elgi
112.
Modification to fixing   arrangement for blow out coil of CGR to ensure locking of tap changer No.32 type
15.9.82
EL/3.2.30/             CG
113.
Relocation of both the existing rubber stopper supporting panto new position under the upper articulation tube
13.12.82
EL/2.2.1/JCG
114.
Modification to cup formation in spring loaded sleeve (PB6040) of air blast circuit breaker (DJ) of M/s HBB make
10.12.82
EL/2.2.2/CG
115.
Potential segregation of signalling fuse cable of silicon rectifier  supplied by Hind   Rectifier Ltd.
28.4.83
EL/3.5.28/ Thy
116.
Conversion of spare standard contact into   BOM contact of QC VAR Relay of M/s English Electric Co. Madras
8.11.83
EL/3.2.10/5/CG
117.
Provision of series resistance with MTDJ coil of DJ type 30 kg of M/s Hindustan Brown Boveri
3.12.83
EL/3.1.3
118.
Modification to English Electric make QOA Relay
13.12.83
EL/3.2.10/5/CG
119.
Modified Mid Point Earthing scheme for WAM4 locos
12.9.84
EL/3.1.3 &  EL/3.1.23
120.
Modified flexible connection (1623) between CGR & GR of  Tap Changer type No. 32 of HBB make
16.3.84
EL/3.2.30/ CG
121.
Oil and Heat resistance hose for exhausters exhaust pipe application
Mar’84
EL/3.2.1
122.
Cleat fixture (Freight Loco transformer)
2.7.85
EL/3.2.1/2
123.
Modification to explosion vent of transformers to prevent oil splashing inside the locomotive
22.4.85
EL/3.2.1/2
124.
Modification to neck portion of transformer
22.4.85
EL/3.2.1/2
125.
Modification to cooling pipe inside the  transformer
22.4.85
EL/3.2.1/2
126.
Modification in DJ control circuit on AC loco
22.4.85
EL/3.2.1/2
127.
Introduction of locate between the making surface of cams and cam shaft and on group screws and tapped holes of tap changer No.32 of HBB make
24.6.85
EL/3.2.30/CG
128.
Provision of grub screws for locking bush and gear housing assembly of manual drive for tap changer No.32 HBB make
24.6.85
EL/3.2.30/ CG
129.
Modification to smoothing reactor connection  cable cleats
11.9.85
EL/3.2.2/CG
130.
Modification to English Electric make Q45 Relay
6.5.86
EL/3.2.10/5
131.
Provision of new slotted bar increased threaded length in place of the existing in order to arrest extension beyond 2 mts height
21.5.86
EL/2.2.1/J6
132.
Safety value operated signalling device and oil duct system of tap changer type No.32 of HBB make
10.6.86
EL/3.2.30/J6
133.
Staggering of RGR grids of tap changer No.32 of HBB make
30.7.87
EL/3.2.30/J6
134.
Provision of QLA relay for protection of auxiliary relay circuit in the event of phase fault / overcurrent ( SKEL-3890 Rev 1)
22.6.98
EL/3.1.3/
135.
Modification for blocking of CAB/Corridor apertures under the floor plates on WAM4 locos
9.7.98
EL/3.1.3/DA1
136.
Provision of Panto raising spring catcher to hold the spring in case of breaking.
31.7.86
EL/2.2.1/J6
137.
Modification for BBC make DI type QIM Relay
17.7.87
EL/3.2.10/Gen/ J6
138.
Modification in insulating ring (1218, 1219) Fixing arrangement
3.11.89
EL/3.2.30/J6
139.
Modification to negative connection lead of  Com. Pole coil (Lead No.15) on TAO 659TM
5.7.90
EL/3.2.27/J3
140.
Design improvements and provision of silver insert in the CLW make EP contactor
25.10.90
EL/3.2.7/J6
141.
Modification to improve the oil circulation in the neck portion of transformer
25.3.91
EL/3.2.1/2
142.
Replacement of cast iron transition resistance (RGR) by stainless steel transition resistance in tap changer type No.32 of M/s HBB make
17.5.91
EL/3.2.30
143.
Modification to  clamp of commutating pole of TAO 659 traction motor
13.12.91
EL/3.2.5/J3
144.
Superseded by WAM4/163 Rev IIIModification on transformer tank to overcome tank cracks
Apr 94
EL/3.2.1/
145.
Prevention of suspension bearing of oil leakage into the stator frame
22.1.92
EL/3.2.5/J3
146.
Provision of thread locking compound on bolts/screws
30.1.92
EL/3.2.5/J3
147.
Modified support plate assembly for main pole and comm. pole of TAO 659 TM
30.1.92
EL/3.2.5/J3
148.
Modified adjustment punching for main pole core assembly of TAO 659 TM
30.1.92
EL/3.2.5/J3
149.
Modified adjustment shim and silirite shim for comm. Pole core of TAO-659 TM
30.1.92
EL/3.2.5/J3
150.
Improved insulation scheme for inter connector of TAO 659 traction motor
30.1.92
EL/3.2.5/J3
151.
Adoption of steel strips in place of existing carbon strips for SMC pantograph type BR 23 LE.
 
27.03.1992
 
EL/2.2.1/1
152.
Rewinding details Siemens make of  MCP type 12 A6 186-6
Nov 1992
EL/3.2.92.3
153.
SMC Pantograph
24.3.93
EL/2.2.1/1
154.
Improved inter connection layout for TAO 659
7.4.93
EL/3.2.82
155.
Brake blocks with medium phosphorus contents for electric locomotives
7.6.93
EL/3.2.19
156.
Measures to improve the reliability of traction loco transformer
Jul 1993
EL/3.2.1
157.
Rewinding of MCP  Siemens make of 10.5 KW/14 HP, TEFC with dual coat wire or double glass covered copper enamelled conductor type IL-A6188 GYA-20.2
15.10.93
EL/3.2.22/3
158.
Conversion of WAM4 locomotive to dual brake system
22.2.94
EL/3.1.3/J2
159.
Conversion of WAM4 locomotive to dual brake system
22.2.94
EL/3.1.3/J2
160.
Head light control circuit
22.2.94
EL/3.1.3/J2
161.
Provision of crepe paper on bare bus bars of transformer
29.4.94
EL/3.2.1/J6
162.
Provision of anti-vibration pads for  MVMT
3.2.95
EL/3.2.48/J3
163.
Tolerances between motor bars and slots to be adopted on M/s Jyoti make of Arno Convertor.
29.12.94
EL/3.2.11
164.
Conversion of  transformer type BOT-3460 to Type HETT-3900
Jan 95
EL/3.2.1
165.
Modification to the protection screen of pinion end shield of TAO 659 TM
18.4.95
EL/2.2.5
166.
Provision of canopy on safety valves of tap changer type No.32 of  M/s. ABB
Apr 95
EL/3.2.30
167.
Adoption of forged armature Rear on the armature shaft of             TAO 659           Traction Motors.
23.5.1995
EL/3.2.5
168.
To provide capacitors across u,v,w terminal of MCP and arno convertors
7.8.9925.11.99
EL/3.2.70
169.
Provision of high capacity after cooler on air brake locomotives.
May 95
EL/3.2.15
170.
Adoption of Teflon ring in lieu of Teflon band on the exposed surface of V cone of  traction motor (SKEL 4348 4350)
25.5.95
EL/3.2.5
171.
Permanent connection of 16th tap in place of spring loaded connection (SKEL-4373)
4.6.96
EL/3.2.30
172.
Modification to headlight circuits of WAM4
27.5.96
EL/3.1.3
173.
Improved interconnector layout for TAO 659 Traction Motors with potted single section field coils.
3.1.1997
EL/3.2.5
174.
Provision of electromagnetic unloader value on electric locomotive ( SKEL-4359)
15.11.96
EL/3.2.15
175.
Adoption of improved BHRR assembly on Traction Motor type TAO-659 with flexible lead wires.
12.12.1996
EL/3.2.5
176.
Provision of  EMU type after cooler on air brake locomotive ( SKEL-4406)
4.6.97
EL/3.2.15
177.
Improvement in the design of armature shaft of TAO-659 Traction  Motors.
 
16.9.1997
EL/3.2.66
178.
Replacement of incoming steel braided flexible pipe by flexible reinforced rubber pipe connected to VCB/Air Blast circuit breaker
10.3.98
EL/3.2.61
179.
Measures to prevent burning of sylsen receiver transmitter of notch repeater used in electric locomotives
31.3.98
EL/3.1.3
180.
Modification to provide HRC fuses for protection of RPS in AC Elect. Loco (SKEL-4457 to 4460)
31.3.98
EL/3.1.3
181.
Modification in the centre hood of 20400 & 20500 series of WAM4 locomotives to prevent water leakage ( SKEL-4469)
30.4.98/5.5.98
EL/3.1.3
182.
Modification to provide armature /voltmeter for  metering of  6P combination locomotives (SKEL-4470)
14.5.98
EL/3.1.3
183.
Modification to remove HQ PDJ switch from the control circuit of elect locomotives
11.8.98
EL/3.1.3
184.
Modification in the control circuit of EM contacts
27.5.98
EL/3.1.3
185.
Modification of taking the tapping for rising the height of magnetic unloader valves from the top of CP delivery pipe provision of one extraT type strainer in series to improve the reliability of magnetic unloader values
22.5.98
EL/3.2.19
186.
Replacement of the existing latching type of fixing arrangement with bolted design of cradle cover of vacuum circuit breaker type 20 B (SKEL-4472)
29.5.98
EL/3.2.61
187.
Adoption of Nylon Pinion for oil pump assembly of  Traction Motor type TAO-659.
May 98
EL/3.2.5
188.
Auto regression of GR on energisation of over voltage (Q20) relay(SKEL-4473-4474)
11.8.98
EL/3.1.3
189.
Paralleling of interlocks of relays and switches in the control circuit of DJ /VCB to improve reliability (SKEL-4487, 4488)
23.10.98
EL/3.1.3
190.
Adoption of modified bottom inspection cover on TAO-659 Traction Motors
17.11.95
EL/3.2.5
191.
Adoption of modified brush holder assembly on traction motor type TAO-659
5.2.1999
EL/3.2.5
192.
Provision of additional filter in Pneumatic Circuit of Air Blast circuit breaker of HBB make(SKEL4032A).
1987
EL/2.2.2/J6
193.
Alteration of connections in dynamic braking resistance of BHEL make.
7.11.1989
EL/3.2.29/CG
194.
Elimination of of position 1-2 in panto selector switch ZPT to avoid raising of both the panto at at time.
05.02.99
EL/3.2.53/2
195.
Modification to control circuit of compressor and  associated pneumatic circuit  on WAG5 class of electric locomotive.(SKEL-4016/A_
19.2.91
EL/3.1.22
196.
Modification to control ckts of tap changer on WAG5 locos SKEL-4032A
21.5.91
EL/3.1.22
197.
Provision of additional silver tip contacts in  parallel with existing main contacts on make up EP line contacts ( SKEL-4086, 4087)
19.2.92
EL/3.2.7
198.
Provision of glass  fuse of  5 Amps. In series with diode across input supply of M/s Kaysy Radha Krishan make flasher units. (SKEL-4100)
20.8.92
EL/6.4.7.4/J12
199.
 
Use of ABB make PC8  relay for QC VAR application as an alternative to E.E. make QC VAR (SKEL-4096/ A)
22.09.93
EL/3.2.10/14
200.
Modification arrangement of air inlet wire mesh be fitted on to the underframe below BHEL make DBR having horizontally mounted blower motor (SKEL-4240)
31.3.93
EL/3.2.29
201.
Modification of switzer make air flow relays
4.10.93
EL/3.2.39/4
202.
Provision of KNOB type device for wedging of PC-8 relay without opening cover (SKEL-4249)
13.12.93
EL/3.2.10/Gen
203.
This Ms is superseded . New MS No ELRS/MS/0297 issued on 25.10.2000
2.8.93
EL/3.2.10/Gen
204.
Provision of RC suppression circuit across C-118 contactor coil (SKEL-4292, 4293)
13.4.94
EL/3.2.8/1
205.
Provision of visual indication for the functioning of blower motor in EATOM make dynamic braking equipment (SKEL-4295)
21.4.94
EL/3.2.29
206.
IMPROVEMENT MEASURES FOR SMOOTHING REACTORS TYPE: SL - 42 AND SL - 30
28.4.1994
EL/3.2.3
207.
Use of solid state buzzer in lieu of conventional type horn  (Soni-2, BCR1-2) (SKEL-4319)
2.12.94
EL/2.2.29
208.
Design improvement for CLW make EP contactor.
24.2.95/ 10.3.95
EL/3.2.7
209.
Reliability improvements in relays
24.2.92
EL/3.2.7
210.
Replacement of grease bearing by sealed bearing in non driving end of Blower motor of EATON make DBR
5.2.96
EL/3.2.29
211.
Isolation of locomotive breakers in case of rheostatic braking (SKEL-4403,4404)
14.5.97
EL/3.2.108
212.
Provision of replaceable bushes in Traction Motor gear case mounting lugs of Traction Motor type HS - 15250A.
29.01.98
EL/3.2.172
213.
 
old as WAG5/24 dated 29.1.1998
Adoption of modified commutator and bearing bracket on Traction Motor     type HS 15250A
29.01.96
EL/3.2.172
214.
Duct extension and air inlet cone arrangement  in locomotive fitted with high capacity DBRs(SKEL-4436)
19.1.98
EL/3.2.29
215.
Adoption of modified insulating rod assembly (for positive & negative support)and modified fixation arrangement of BHRR flexible cable interconnectors for Traction Motor type HS 15250A
25.2.98
EL/3.2.172
216.

ELRS/MS/WAG5/241 to be read with MS no.347
Adoption of modified brush holder insulator assembly insulating rod and brush box along with the provision for arcing studs on BHRR assembly of Traction Motor type HS-15250A
27.2.98
EL/3.2.172
217.
Provision of rubber bush inside the open end of longitudinal tube of AM-12 type pantograph (SKEL-4434)
9.3.98
EL/2.2.1
218.
legible copy
 
Modified earthing arrangement of cable used in cable head termination system (SKEL-4452)
18.3.98
EL/3.2.21
219.
ELRS/MS/WAG5/244 with Amend-1 dtd:21.09.98.
Amendment-2 dtd:14.02.2014
Modification in the pinion end portion of armature shaft of Traction Motor type HS 1050Er/HS15250A
30.3.98
EL/3.2.172
220.
Modification in the QRS relay feeding circuit to prevent its de-energisation during blending with air brakes on load through A9 wire rheostatic braking on electric locomotives
31.3.98
EL/3.1.22
221.

ELRS/MS/WAG5/246 has been superseded by MS.No.364
Adoption of modified support clamps, hook and hinge assembly for inspection cover of  Traction  Motor type HS 15250A
Sept 98
EL/3.2.172
222.
old no. WAG7/1
Provision of stopper plates for preventing falling of center pivot assembly of Co-Co high adhesion bogies (SKEL-4435)
14/13.1.98
EL/3.2.13/6
223.
Modification to gear case assembly of WAG7 Locomotive
13.1.98
EL/3.2.13/6
224.
Wheel wear on WAG7 locomotives
21.1.98
EL/3.2.13/6
225.
Improvement in the performance of centre pivot rubber bush fitted in WAG7 locomotives (SKEL-4437)
20.1.98
EL/3.2.13/6
226.
Lubrication arrangement in the pins and bushes for equaliser and compensating beam for WAG7 locomotives
21.1.98
EL/3.2.13/6
227.
Wheel wear on WAG7 locomotives removal of side stops from the existing 4 nos. per bogie to 2  nos.  per bogie  (SKEL-4438)
21.1.98
EL/3.2.13/6
228.
Rearrangement of under frame cable layout for WAG7 locomotives.
5.2.98
EL/3.1.38
229.
Replacement of existing rotary auxiliary switch with double brake fish bone type auxiliary switch on Alsthom make VCB type 20 CB.(SKEL-4509  A3)
25.2.99/ 4.3.99
EL/3.2.61
230.
 
Modified terminal block for  120 KVA Arno Convertor of  M/s. Jyoti Make(Jyoti Drg. No. 2EK-3030  R4).
30.3.99
EL/3.2.11
231.
Provide  N/C interlock of C 118 as a input(SKEL-4520  A4)
30.3.99
EL/4.2.15
232.
Provide N/C interlock of  QCVAR in C 118 coil branch ( SKEL- 4519  A4)
-do-
-do-
233.
Introducing interlock at position 1 of  HMCSI & HMSCII as a input.(SKEL  4521  A4)
-do-
-do-
234.
Providing  support to the bracket of display unit ( SKEL-4522  A4 )
 
 
235.
Removal of D-24B/D-24BM feed valve set at  8.0 kg/sq.cm from pneumatic circuit of Electric Locomotive.
23.6.99
EL/3.2.19
236.
Modification in the DBR control circuit to prevent opening of C 145 contractor with snap action in case of :-
1.     Energisation of  QF1, QF2, QE relays.
2.     Energisation of  SWC due to application of brake through SA9 by driver while in dynamic braking modes
29.6.99
EL/3.1.3
237.
Improvement Measures to improve the reliability of air dryers.
26/29.7.99
EL/3.2.19
238.
Simplification of Sander Pneumatic circuit.
26.7.99/9.8.99
-do-
239.
Mod. in passenger emergency alarm indication circuit to prevent its operation during normal brake application through A9 by the  driver.
9/12.8.99
EL/3.2.19
240.
Provision of  Metallised Carbon  strips in place of steel strips on Pantographs type AM-12 or similar design.(SKEL-4303, Rev. 2   A3 )
23/25.8.99
EL/2.2.25
241.
Modification to removal of LE1 & LE2 from the control circuit of Electric Locomotive.
6.9.99
EL/3.1.3
242.
Provision of   inch  isolating  cock without bent in place of diaphragm cock for panto circuit.
30.9.99
EL/3.2.19
243.
Removal of  pressure switch GCR connected to control pressure pipeline of  BA Panels and its buzzer.
30.9.99/4.10.99
EL/3.2.19
244.
Modification in the air supply line to ensure effective operation of the oil pump ( PHGR) fitted with the oil pump devices ( OPD) in the ADtranz make  tap changer No. 32.(SKEL- 4539  A4 )
25.10.99
EL/3.2.30
245.
Standardisation of location of BP/FP isolating cocks in Electric Locomotives(SKEL-4542 Alt.0)
29.10.99/8.11.99
EL/3.2.119
246.
Control circuit modification to switch off MVRH in case of switch over from traction to dynamic braking  mode in WAG7 Locomotive fitted with DBR of  M/s. KEC with 3-phase MVRH of  34  KVA.
26.10.99/5.11.99
EL/3.1.3
247.
Provision of brass ferrule in place of aluminium ferrule on roof bars. (SKEL-4543 Alt.0A4)
24.11.99
-do-
248.
Provision of safety clamp for C2W relay valve to prevent first supply value assembly from failing.( SKEL- 4544   Alt.0 A3 )
30.11.99
EL/3.2.19
249.
Provision of rain shed on end caps at either end or  horizontal insulator flange of  vacuum circuit brake type  20 CB of  M/s. Alsthom.(SKEL 4545    Alt.0 A4 )
9.12.99
EL/3.2.61
250.
Provision of  safety bracket arrangement of  WAP1 and WAP4 brake hanger lever of end wheels (SKEL 4546  Alt.0 A3)
3.12.99
EL/3.2.13/1
251.
Dropping of split pin cotter for equiliser pin in high adhesion bogies SKEL-4456
1.4.98 / 5.4.98
EL/3.2.13/6
252.
Improvement in the performance of side bearer assembly fitted in WAG7 locomotives
19.11.01
EL/3.2.13/6
253.
Provision of modified support arrangement for XLPE cable in base make cable head termination system (SKEL-4492)
11.1.99
EL/3.2.21
254.
Provision of separate fuse for static inverter control circuit.
18/22.3.99
EL/11/1.2.9 (A)
255.

ELRS/MS/0280
Provision of grease outlet i.e. drain hole in CE outer bearing cap of TM type HS 15250 A and procedure for re-greasing of armature roller bearing (PE & CE)
29.1.98
EL/3.2.172
256.
Side stopper arrangement in lieu of tie bar arrangement for WAG-7,WCAM-3 & WCAG-1 class of locomotives.
30.3.2000
EL/3.2.13/6
257.
Provision of modified sanding pipe arrangement for WAP1/4 class of electric locomotives
14.9.2000
EL/3.2.13/1
258.
Provision of modified guide assembly for outer connection straps on flexi coil MARK -I bogies of WAP1/4 class of locomotives.
6.6.2000
EL/3.2.13/1
259.
Provision of modified trunnion for use on end brake hangers of flexi-coil MARK-I bogies of WAP1/4 class of locomotives.
16.8.2000
EL/3.2.13/1
260.
Provision of tolerances and depiction of hardened zone on connection strap bush seat on the sleeve provided on inner brake hangers on flexicoil MARK-I bogies.
8.8.2000
EL/3.1.13/1
261.
Provision of modified brake hangers inner as well as outer on flexi-coil MARK-I bogies used in WAP1/4 class of electric locomotives.
8.8.2000
EL/3.2.13/1
262.
Provision of bracket for tail lamp in front and back of Electric locos.
26.5.2000
EL/3.1.38
263.
ELRS/MS/0288
Remedial measures for the problems being faced by the Railways on implementation of RDSOs modification sheet No. WAM4/193 for working of headlight while passing through neutral section.
6.6.2000
EL/3.1.3
264.
Modification in Mio filter panel assembly for better air supply, reduction in dust and increase in cleaning intervals.
26.6.2000
EL/3.2.47/1
265.
To provide epoxy moulded terminal box cover for auxiliary motors of electric locomotive.
18.12.2000
EL/3.2.70
266.
Provision of  air strainer in the common pipe line connected to port No. 30 of A9 and SA9 pneumatic valves.
21.8.2000
EL/3.2.19
267.
GR progression and regression valve emergency operation circuit modification in microprocessor based WAG7
18.7.2000
EL/4.2.15
268.
Modification to the headlight voltage stabiliser for use with twin beam head light of WAP1/WAP4/WAM4/WAG5/WAG7 and AC/DC class WCAM3/WCAG1 locomotive
13/14.9.2000
EL/3.1.3
269.
Rewinding scheme for the existing 14 HP compressor driving motor (MCP) of M/S ABB,CGL and BBL makes suitable for high starting torque
21.9.2000
EL/3.2.92
270.
Rewinding of stator winding of MVMT and MVRH of CGL/Siemens make with dual coated winding wire confirming to IS:13730 Pt-13
25.9.2000
EL/3.2.70
271.
To increase the oil filling interval of compressor type TRC 1000 MN of ELGI make by increasing the sump capacity.
29.9.2000
EL/3.2.15
272.
Utilisation of NO Volt Relay (Q30) For low voltage protection of auxiliary machines in AC locomotives.
28.9.00/25.10.2000
EL/3.2.10/
Gen
273.
Introduction of delay in the starting of compressor motors in order to improve the reliability of  ARNO as well as compressor motor
14.11.2000
EL/3.1.3
274.
Modified pick up value of QD relays provided in power circuit of WAG7 class of locomotive.
23.10.2000
EL/3.1.3
275.
Adoption of modified terminal box cover on traction motor type HS 15250A.
23.04.2001
EL/3.2.172
276.
Adoption of modified Terminal Box cover on TAO-659 Traction Motor.
30.10..2000/7.11..2000
EL/3.2.5
277.
Replacement of existing rotary auxiliary switch/conversion of existing ON LOAD fish-bone arrangement to OFF-LOAD (with inverted cam & 16 F.R.P. operation rod) on double bottle vacuum circuit breaker type 20 CB of Alstom.
31.10.2000/10.11.2000
EL/3.2.61
278.
Adoption of modified oil pump on TAO-659 traction motor having plain sleeve suspension bearings.
24.11.2000/14.12.2000
EL/3.2.5
279.
Replacement Of  existing 1/2inch pipe line connected from MR3 reservoir through air flow measuring value to plot no.1.of additional C2 relay  value and connected from Part no.3 of additional relay value through brake pipe in electric loco motive with  pipe line.
9.2.2001
EL/3.2.19
280.
Modified Specification of leather bellow for T.M of Electric Locomotive
29.5.2001
EL/3.2.8.5
281.
Modification to electrical weight transfer compensation  circuit in WAG7 locomotive
28.08.01
EL/3.1.3
282.
Modification in the pins, bushes and cotter of Equaliser and compensating beams of WAG7 locomotive for better wear life
26.9.01
EL/3.2.13/6
283.
Modification to prevent damage/breakage/falling of after cooler drain cocks due to external hitting
29.10.01
EL/3.2.19
284.
Modification to the bottom plate of centre pivot pin on WAG7 loco
16.11.01
EL/3.2.13/6
285.
Adoption of improved version  (high current carrying capacity) of EM contractor for C 105/C106 (MVMT), C 101, 102, 103 (MCP) and C 107 (MVRH) Applications
26.11.01
EL/3.2.8/3
286.
Modification of control circuit of static converter for soft start of auxiliaries except compressor
29.11.01
EL/1.2.9.1
287.
Adoption of modified gear case assembly on traction motor type HS 15250 A
28.5.02
EL/3.2.115
288.
Modification to reduce weight of metallic pinion of TAO-659 Traction motor suspension bearing oil pump pending provision of nylon gear as specified under earlier modification sheet
10.6.02
EL/3.2.5/1
289.
Modification of Drive End - Outer Labyrinth of WAG9/ WAP7 Traction Motor type 6FRA 6068
12.7.2002
EL/3.2.182
290.
Provision of vertical DBR on WAP1/WAP4 (non-modular locomotive
1.8.02
EL/3.1.23
291.
Provision sleeve on centre Pivot pin in WAG7 locomotive
31.7.02
EL/3.1.13/6
292.
Modification in MVRF circuit of non-modular WAG7 locomotive
28.8.2002
EL/3.1.38
293.
Modification of control circuit of AC dual brake locomotive provided with static converter with soft start for rolling stock application
29.8.2002
EL/1.2.9.1
294.
Flasher indication during train parting and alarm chain pulling for microprocessor loco
29.11.2002
EL/4.2.15
295.
Rising of height of battery box from rail level on WAP5 and WAP7/locomotives
3.1.2003
EL/3.1.1.35/2
296.
 
Indication of audiovisual indication of flasher light circuit with audiovisual indication of passenger alarm chain system provided on dual and air brake locomotives
31.12.2002
EL/3.2.19/2
297.
Modification of RC damping panel on the locomotive provided with static converter of air brake/dual brake ac electric locomotive
29.1.2003
EL/1.2.9.1
298.
Modification to improve reliability of headlight circuit for working headlight while passing neutral section, earlier issued vide RDSO Modification Sheet No.WAM4/173, WAM4/181, WAM4/193 of ELRS/MS/288
31.3.03
EL/3.1.3
299.
Provision of oil trap chamber in train pipe of constructor tank of locomotive transformer
31.3.2003
EL/3.2.1
300.
Modification of twin beam headlight with DC-DC converter
29.5.2003
EL/6.11.1
301.
Modified insulation scheme for TAO 659 Traction Motor Armature Coils
24.6.2003
EL/3.2.5
302.
Led indication on Drivers Desk to indicate tripping of Static Converter
31.7.2003
EL 1.2.9.1
303.
To  provide water discharge outlet in TM Scavenge  Blower on WAG9, WAP5 & WAP7 class of Locomotives.
29.10.03
EL 3.2.176.2
304.
 

Replacement of Hitachi Traction motor Brush holder spacers for HS15250A Traction Motor made of brass with PTFE.

         13.01-2012

           EL/3.2.100
305.
Provision  of  CTF3   contact in  C145 circuit
27.4.04
EL.3.1.3
306.
Modification  Of  arrangement of fitment lubricating pins  for  WAG7/WCAM3/                                  WCAG 1
23-11-04
EL.3 .1.3.
307.
Prevention  of shifting  of center   pivot rubber bush and steel  bush  provided  in  worn  out centre  pivot  pin  in  WAG7 locomotives.
08-12-04
EL/3.2.13/6
308.
Standardization of Panto Pan Assembly of AM12 or similar Pantograph for Electric Locomotives and EMUs
28.12.2004
EL/2.2.1
309.
 Withdrawal of capacitors across U, V & W terminal of main compressor of Static Converter fitted Locomotives.
20.12.2014
EL/1.2.9.1
310.
Provision of time delay relay in control circuit of ac Static
Converter fitted locomotive
28.01.2005
EL/1.2.9.1
311.
Provision of   auxiliary interiock no 9-10  of SMGR series with  exsting  interlock  no.89-90 on 62 branch to avoid RGR  overheating/burning  due to closing  of DJ/VCB in case of GR inbetween 1& 0 notches..
14.02.05
EL/ 3.2.30
312.
Enhancement of cooling of rotors of 3-phase traction motor.
24.5.2005
EL/3.2.182
313.
Utilisation  of  imported  centre  pivot rubber bush in WAG7 locomotive provided with pivot pin haveing uniform dia of 246 mm
31.05.05
EL/ 3.2.13/ 6
314.

ELRS/MS /0339 Rev.01
Provision of visual indication along with push botton switch on having gear ratio 18:65 /16:65.
04.04.2014
EL/3.1.28
315.
Replacement of metallic corrugated steel pipe/out side steel braided flexible pipe by flexible reinforced rubber pipe connected in between VCB/Air blast circuit breaker & Air drier and main air pipe line to air drier.
29.06.05
EL/3.2.61
316.
Modification for removal of BLSI Switches in Static Converter fitted.
18.10.2005
EL/1.2.9.1
317.
Provision of Surge suppression capacitor in Auxiliary Converter of 3-ph loco
16.12.2005
EL/11.5.5/2
318.
Reha bilitation  of ingersoll  rand model 71 t2rl (1000LPM) & model 15 TRL(2000LPM) compressors to improve the reliability of electric lomotive.
19.12.05
EL/ 3.2.25
319.
Modification in control circuit of 3phase locomotives.
28.4.06
EL/ 3.1..35/2
320.
 
 
Standradardisation  of  earthing   switch arrangement on 3phase locomotives to make interchangeable of various makes VCB between single &3phase locomotives
08.05.06
 
 
13.02.14 
EL/ 3.2.61(G)
321.
Pneumatic  pipe line connection for  RGCP pressure    switch and VEAD electro magnetic valve
24.05.06
EL/ 3.2.19(G)
322.
Adoption  of modified  arcing  stud & fixing bracket BHRR assembly  of T.M.type HS-15250A
31.07.06
EL/ 3.2.172
323.
Retro-fitment of ACMVRF in place of existing dc mvrf provided in vertical dbr.
22.09.06
EL/3.2.29
324.
 
 
Modification of providing additional isolating cock in series with existing BP Angle Cock in pure air brake and dual brake electric locomotive
18.5.07
08.06.2015
EL/3.2.19(G)
325.
Modification of fixing arrangement temperature sensor  fitted on traction motor type 6FRA 6068 of WAG9/WAP7.
01.11.2007
EL/3.2.182
326.
Modified suspension arrangement for battery box in WAP1/4 locomotives.
17.12.2007
EL/3.2.13   D4
327.
Relocation  of  air suction filter on m/s ELGI make compressor type RR-20100 mounted on WAP5.,WAP7 &WAG9 class on electric locomotives to improve the down type period of locomotives during scheduled inspection
02.01.08
EL/3.2.15(3 phase)
328
Provision of rotary switch in circuit of cab fan of siv fitted loco.
23.01.08
EL/1.2.9.1
329.
Modification in arm of friction piston device in cast steel blast of WAP1 / WAP4
28.01.08
EL/3 .2.13
330.
Modification to support the DE and NDE side overhangs and augmentation of insulation scheme of stators of Three phase traction motor type 6FRA 6068 during
18.11.2010
EL/3.2.182
331.

RDSO/2007/EL/MS/0356 Rev’1’ Superseded by RDSO/2007/EL/MS/0355 Rev’2’
Modification to support the DE and NDE side overhangs and augmentation of insulation scheme of stators of Three phase traction motor type 6FRA 6068 during
18.03.2008
EL/3.2.182
332.
Modification in Control Circuit of Flasher Light and Head Light of 3-phase electric locomotive
20.02.2008
EL/3.1.35/2
333.
Provision of 16th Notch regression in SMGR in electric Locomotives provided with Roof Mounted DBR. 
29.02.08
No. EL/3.2.29/6
334.
Replacement of existing filter with sintered bronze filter  & 3/8 air strainer in the pneumatic circuit & Electric locos motives.
 
EL/3.1.19 (G)  D2
335.
Modification sheet on shifting of transformer conservators location from OCB duct to an independent stand provided in between SR and MR blower in 3 phase drive locomotives.
07.04.08
EL/3.1.3
336.
Revision of the setting of QD relay in WAG5 and WAG7  locomotive.
23.04.08
EL/3.2.182
337.
Modification in unmodified 1000 m PS Reverser Servo motor to avoid breakage of fork roller bush & shaft.
 
EL/3.2.9       D4
338.
Modified top and bottom lug for Hitachi TM.
17.07.08
EL/3.2.172
339.
Modified inspection cover for Hitachi TM.
02.06.08
EL/3.2.172
341.

Improved Grounding of ALG rack in TRACTION CONVERTER of  3φ electric locomotives.
28.07.08
EL/3.2.182
342
Provision of inspection window in filter cubicle.
29.08.08
EL/3.2.182
342.
Modification of mounting arrangement of MCB-100 (circuit breaker battery charger) fitted in aux. Converter (BUR 3/30x2) of 3 phase elect. Locos.
29.08.08
EL/3.2.182
343.
Modification on end punching of armature and provision of U-shape insulation on slot end portion for TAO-659 tm.
29.09.08
EL/3.2.182
344.
Modification in Brake Assembly of WAP7 Electric Locos
04/11/2008
EL/3.1.35/2
345.
Modification in the size of TM circuit Cables of WAP5 Electric Locomotives.
26.11.2008
EL/2.2.24      (ED)
346.
Provision of change over switch in Traction Converter for speed sensor of Traction Motor
21.01.2009
EL/11.5.5/1
347.
Modification in Aux. converter of  3 phase Electric locos to improve reliability.
20.01.2009
EL/11.5.5/2    (D7)
348.
 

MS373 is superseded by MS-476
Modification of Bellows and its Mounting arrangement of existing Traction Motors type 6FRA 6068 used in WAG9/WAP7 class of locomotives (retrofitment).
15.04.2013
EL/3.2.85
349.
 
MS374 is superseded by MS-476
Modification of Bellows and its Mounting arrangement on New Traction Motors type 6FRA6068 used in WAG9/WAP7 class of locomotives(new manufacturing). 
15.04.2013
EL/3.2.85
350.
Provision of MCB (128.1) in Air Dryer circuit of 3-Phase electric locomotives
28.09.12
EL/3.1.35/2
351.
Modification to voltage sensing circuit in WAP-5,WAP-7,WAG-9 & WAG-9H Locomotives
22.04.2009.
EL/3.1.35/2
352.
Modifications in NS/AS Controller Cards (PPA988B02) and Gate Unit of Power Converter of three phase locomotives
19.06.2009
EL/11.5.5/1
353.
Relocation of port connection of QVRF relay provided on  AC MVRF fitted vertical DBR.
23.06.2009
EL/3.2.29
354.
Closure of two central ventilators in WAP-7 and WAG-9 locomotives
14.07.2009.
EL/3.1.35/2
3545
Provision of Conventional Brake Rigging Arrangement in 25kV AC 3-Phase Electric Locomotive type WAP-7 for High speed operation
07/09/2009
EL/3.1.35/2 (Brake Lever)
356.
Modification in QVCD interlocks connection in Q51 circuit
10.09.09
EL/3.1.14
357.
Provision of LED indication near Q-50 relay for indicating status of C 145 capacitor.
07.10.2009
EL/3.1.3
358.
RDSO/2009/EL/MS/0384 (Rev-’0’)
Modification of loco control circuit for circuit breaker (DJ) opening and panto lowering by BLDJ and ZPT switch in 25 kv conventional locomotive equipped with microprocessor based control and fault diagnostic system (MPCS
07.10.2009
EL/4.2.15
359.
Partial blocking of opening duct of back side of auxiliary converter of three phase electric locomotives
15.12.2009
EL/11.5.5/2
360.
Modification in loco control circuit for Multi Unit operation (MU) max. for three locos for 25 KV AC electric locomotives working with microprocessor based control & fault diagnostic system(MPCS) as per RDSO's specification no. ELRS/SPEC/MPC-FDS/0001 Rev-'2'-August 2005 (ver-2)
29.10.2012
EL/4.2.15
361.
Provision of grease outlet channel at NDE side of TM type 6FRA 6068 used in WAG9/WAP7 class of locomotives
07.07.2010
 
EL/3.2.182
362. RDSO/2010/EL/MS/0388(Rev ’0’)

Provision of additional 1000 LPM compressor in WAP-4 class of Electric locomotive with segregated pneumatic valves layout arrangement.

 23.07.2012  EL/3.2.19(G)
363.
Provision of additional spring catcher to prevent the main raising
spring to fly off in case of breakage of spring of AM-12 or similar
design pantographs used on electric locomotives and EMU/
MEMU.
10.03.2011
EL/2.2.1
365. RDSO/2010/EL/MS/0390 Rev.’0’ Paralleling of interlocks of EP contactors and relays of three phase locomotives to improve reliability. 31.12.10 EL/3.1.35/2 Electrical
366. RDSO/2011/EL/MS/0391 Rev.’0’   Replacement of ECSX make 24 MHZ crystals by FOX make crystals in electronic cards of three phase electric locomotives 04.02.11 EL/11.5.5/5
367. RDSO/2011ELRS/MS/0392 (Rev.0)  Modification in traction motor Nose suspension system for provision of additional L clamps and split pins to prevent falling of vertical nose pin of traction motor type HS 15250A/TA0659 11.02.2011 EL/1.3.10/3
 368. RDSO/2010/EL/MS/0393 Rev ‘0’

Modification to address failures of Auxiliary converter cards

 12.04.2012 EL/11.5.5/5
369 RDSO/2011/EL/MS/394 Rev ‘0’

Modification in electric locomotive circuit for isolating complete air conditioner circuit in case of earth fault in air condition unit

 09.02.2011 EL/3.1.10/2
370. RDSO/2011/EL/MS/0395 Rev.’0’   Replacement of 10 mm2 cable type 4GKW-AX (Cable no. 1147,1148 and 1149) of oil cooling unit with 16 mm2 cable type 4GKW-AX to improve the reliability of three phase electric locomotives. 28.02.11 EL/3.1.35/2 Electrical
371. RDSO/2010/EL/MS/0396 (Rev’0’)

Modification in Brake hanger mounting brackets (Holder and Support) of WAP-7/WAG-9 Electric locomotives to prevent crack/ breakage of bracket.

 17.10.11  EL/3.1.35/2 (3Phase)
372. RDSO/2011/EL/MS/0397 (Rev’0’) Modification in 3-phase electric locomotive to record message of VCD isolation status. 06.06.12 EL/11.5.5/4
373. RDSO/2011/EL/MS/0398 (Rev’0’)

Rewinding of TAO659 armatures having higher core slot mouth than the existing one to prevent pre-mature condemnation of armatures

 23.06.11 EL/3.2.5 
374. RDSO/2011/EL/MS/0399 Rev.’0’  

Removal of interlocks of control circuit contactors No.126 from MCPA circuit.

 08.08.11

EL/3.1.35/2 Electrical

375.

RDSO/2011/EL/MS/0400 Rev.’0’

Modification sheet for shifting of the termination of 4GKW, 1.8 KV, 70 mm2 cable and 2 X 2.5 mm2 cables housed in lower portion of HB-2 panel and provision of Synthetic resin bonded glass fibre (SRBGF) sheet for three phase locomotives.

10.08.11

EL/3.1.35/2 Electrical

376.

RDSO/2011/EL/MS/0401, Rev.’0’

Modification sheet for relaying of cables in HB-2 panel of three phase locomotives to avoid fire hazards.

10.08.11

EL/3.1.35/2 Electrical

377.

 RDSO/2011/EL/MS/0403, Rev.’0’ Auto switching of machine room/corridor lights to avoid draining of batteries in three phase electric locomotives. 30.11.11 EL/3.1.35/2 Electrical

378.

 RDSO/2011/EL/MS/404 Rev ‘0’ Modification in electric locomotive control circuit fitted with microprocessor based control system (MPCS) for individual isolation of hard/soft QDs during operation of HMCS programme switch 28.12.2011 EL/4.2.15
379.

RDSO/2012/EL/MS/0405 (Rev.0)

Modification of Earthing switch arrangement of conventional Electric Locomotives

03.01.2012

  EL/2.2.1

380.

RDSO/2012/EL/MS/0407, Rev.’0’

Standardization of power selection switch position in flasher units provided in three phase electric locomotives.

14.03.12

EL/3.1.35.2/Electrical
381.

RDSO/2011/EL/MS/0408, Rev.’0’

 Modification of terminal connection of heater cum blower assembly 30.05.12 EL/3.1.3 
382.

RDSO/2011/EL/MS/0409, Rev.’0’

 Provision of N/O interlock of QCON relay in the circuit of QTD 101 coil to avoid SI unit tripping due to working of compressor in soft start mode in rear loco of multiple unit. 30.05.12 EL/3.1.3 
 383. RDSO/2012/EL/MS/410 Rev ‘0’

Circuit modification of I-68 branch for C145 operation feedback for 25 kv ac electric locomotives fitted with MPCS

 04.06.2012 EL/4.2.15
384.  RDSO/2012/EL/MS/0411 (Rev’1’)

Modification sheet to avoid simultaneous switching ON of White and Red marker light in three phase locomotives

        09.12 .11

 EL/3.1.35/2 Electrical
385.

RDSO/2011/EL/MS/0412, Rev.’0’

Addendum-1 of MS-412 dated 8.7.2020

 Provision of isolating cock for unloader valves (12) in E-70 brake system of 3-phase electric locomotives.

22.08.12

08.07.2020

 EL/2.2.1 
386. RDSO/2012/EL/MS/0413 (Rev’1’)

Paralleling of interlocks of EP contactors and auxiliary contactors of three ptlase locomotives to improve reliability.

25.04.16

 EL3.1.35/2/Elect

387.

RDSO/2012/ELRS/MS/0414(Rev.0)

Amendment_1 dtd_29.01.2013

Modified interferences between TM assembly components, in order to ensure adequate interference between assembly components of traction motor type HS15250A.

 03.10.2012 EL/3.2.172
388.

RDSO/2012/EL/MS/0415(Rev 1)`

 

MS/0415(Rev`0’) Amend 1,2,3

 

Modified interferences between TM assembly components, in order to ensure adequate interference between assembly components of traction motor type 6FRA6068.

 12.03.2025 EL/3.2.182
389.

Modification on relocation of BP & FP Angle cock in WAP-1/4 class of electric Locomotives.

 01.11.2012 EL/3.2.19(G)
390. RDSO/2012/EL/MS/0419(Rev.0) Modification to provide rubber sealing gasket in Master controller of three phase locomotives. 03.12.2012 EL/3.1.35/2/Elect

391.

RDSO/2013/EL/MS/420 ReV.0.

Modification sheet to provide mechanical clocking arrangement in primary overcurrent relay of three phase locomotives.

23.01.2013

EL/3.1.35/2/Elect

392.

RDSO/2013/EL/MS/421 Rev ‘1’

Modification of loco control circuit for LSDBR lamp to avoid wrong indication of working of AC MVRF in MPCS fitted Electric locomotives

15.02.2013

EL/4.2.15

393.

RDSO/2013/EL/MS/0422

( Rev`0’)

Use of 5 mm solid end plates in pace of existing 5 x 1 mm thick spot

welded laminated end plates assemblies in stators & rotors of TM type 6FXA 7059.

21.02.2013

EL/3.2.182

394.

RDSO/2013/EL/MS/0423

( Rev’0’)

Use of 5 mm solid end plates in pace of existing 5 x 1 mm thick spot

welded laminated end plates assemblies for stators & rotors of TM type 6FRA 6068.

21.02.2013

EL/3.2.182

395.

RDSO/2013/EL/MS/0424(Rev.1)

Use of Safety Device as an Emergency Support to prevent falling of aluminum gearcase in WAP5 class of Electric Locomotive, during run in the event of breakage of its mounting lug (of aluminum gearcase) due to sudden impulse loading

27.05.2015

EL/3.1.35/23

396.

RDSO/2013/EL/MS/425.Rev’0’

Modification sheet for improving illumination of head light in dimmer mode in three phase electric locomotives.

22.05.2013

EL/3.1.35/2 Elect

397.

 RDSO/2013/EL/MS/0426 Rev.0.

Modification sheet of bogie isolation rotary switch(POS 154 CUT OUT )  in three phase locomotives.

18.07.2013 

EL/3.1.35/2 /Elect 

398.

RDSO/2013/EL/MS/0427 Rev.0’ 

 Modification sheet for MPC control circuit in three phase locomotives.

23.10.2013 

EL/3.1.35/2 /Elect 

399.

RDSO/2013/EL/MS/0428 Rev.0.

 Modification sheet for relocation of earth fault relays for harmonic filter and hotel load along with its resistors in three phase locomotives.

10.12.2013

EL/3.1.35/2/Elect 

400.

RDSO/2014/EL/MS/0429(Rev.0)

Modification sheet for avoiding necessity of CAB changing in case of failure of processor cards of VCU of WAG9/WAG9H three phase locomotives

26.02.2014

EL/11.5.5/4

401.

RDSO/2014/EL/MS/0430/Rev’0’

Modification in loco control circuit for connections for Auto regression by pass(HPAR) switch in 25 KV AC electric tap changer locomotives.

21.01.2014

EL/4.2.15

402.

RDSO/2014/EL/MS/0431/Rev’0’

Modification in loco control circuit for working of VEAD valve in traling locomotive during multiple unit op[eration (MU) for 25 KV AC Electric Locomotive fitted with microprocessor based control and fault diagnostic system (MPSC ver-2)

05.02.2014

EL/4.2.15

403.

RDSO/2014/EL/MS/0432/Rev’0’

Removal of shorting link provided at c-d terminal of over current relay of 3-ph locomotives.

 12.03.2014

EL/3.2.1/3-Ph

404.

RDSO/2014/EL/MS/0433

Modification to provide 1/4 upon 1 ball type isolating cock in place of D-1 emergency Brake valve in tap changer(unmodified CAB)  Electric Locomotives.

28.03.2014

EL/3.2.19(G)

405.
RDSO/2014/EL/MS/0434/Rev’0’

Modification sheet to create low pressure zone above hood ventilator in order to make machine room pressurized and free from dust to avoid failure of Electronic cards in 3 phase locomotives

24.04.2014

EL/11.5.5/5

406.

RDSO/2014/EL/MS/0435/Rev’0’

Modification sheet for avoiding necessity of CAB changing in case of failure of processor cards of VCU of three phase locomotives(WAP7)

01.07.2014

EL/11.5.5/4

407.

RDSO/2014/EL/MS/0436/Rev’0’

Modification to address failures of DC link capacitors of 3x100kVA, GTO based Auxiliary converter.

28.08.2014

EL/11.5.5/5

408.

RDSO/2015/EL/MS/0437/Rev’0’

Modification to avoid failure of temperature sensors due to increase in resistance value of temperature sensor cable shielding.   

14.01.2015

EL/3.1.35/2/Elect

409.

RDSO/2015/EL/MS/0438/Rev’0’

Modification in resistance ring to increase the radial gap between resistance ring and end ring in Scheme-II design of rotors for traction motor type 6FRA6068.

27.08.2015

EL/3.2.182

410
RDSO/2016/EL/MS/0439/Rev’0’

Modification in drawing of outer bearing cap (DE) to drain out ingressed gear case oil from TM type 6FRA6068.

 23.11.2016 EL/3.2.182

411.

RDSO/2014/EL/MS/0440/Rev’2’

SKEL-4993, 4998,4999 Alt-1, 5000,5001,5002 Alt-1

Modification from conventional hand brake to modified hand brake (Gear type) arrangement for WAP-4, WAG-7, WAP-7 and WAG-5 Electric locomotive applications.

31.10.2018

EL/3.2.13/1

412.

RDSO/2015/EL/MS/0441/Rev’1

 
Modification to avoid dropping of slack adjuster assembly (Bottom) in case of brakeage of its split pin in 3-phase WAP-7 loco.

31.10.2018

EL/3.1.35/2(brake lever)

413.

RDSO/2018/EL/MS/0442/Rev’1’

GR-0 indication of middle & trailing locomotives through additional signalling lamps in leading locomotive in multiple unit/consist operation of two/three locomotives

01.08.2018

EL/4.2.15

414.

RDSO/2015/EL/MS/0443/Rev’0’

has been issued replacing the TC no. RDSO/2015  /EL/TC/0130 (Rev.0)

Modification for improving the reliability of motor supports in bogie of WAP-7/WAG9 locomotives.

17.09.2015

EL/3.1.35/2(brake lever)

415.

RDSO/2015/EL/MS/0444/Rev’0’

Modification in Vigilance Control Device in tap changer electric locomotives for:

(i) VCD activation through BL key place of 110 V direct battery supply.

(ii) Removal of VCD acknowledge by horn.

08.01.2016

EL/3.1.14

416.

RDSO/2015/EL/MS/0445/Rev’0’

Provision of 2 Nos. of lubricated compressors of 1750 LPM each on-board mounting in WAP-4 class of Electric Locomotives with modified cab fed by 180 KVA SIV during POH by Electric Loco Sheds.

23.10.2015

EL/3.2.15(3 phase)

417.

 RDSO/2015/EL/MS/0446(Rev.0)

Modification in loco roof bars and fittings on conventional locomotives similar to three phase locomotives.

07.12.2015

EL/2.2.21

418.

 RDSO/2016/EL/MS/0447(Rev.0)

Removal of Anti-slip valve on E-70 & CCB and Flange lubrication manifold of E-70 from 3-phase electric locomotives.

21.03.2016

EL/3.2.19/3-Phase

419.

 RDSO/2016/EL/MS/0448(Rev.0)

Modification to the cabs of 25 kV conventional Electric Locomotives(WAP4 & WAG7) for noise reduction.

 

15.02.2016

 

EL/3.1.10/1

420.

 RDSO/2016/EL/MS/0449(Rev.0)

The reliable and cost effective replacement of cooling fan motor in 180 KVA Staic Converter(AAL Make) having M/s ZIEHL-ABEGG make motor of 0.53 KW by indeginously developed motor.

30.03.2016

EL/1.2.9/1(AAL)
421. RDSO/2016/EL/MS/0450(Rev.0)

Deactivation of Vigilance Control Device (VCD) acknowledge from Asstt. Loco Pilot side on Electric locomotives.

 19.05.2016 EL/3.1.14
   

For others, please click on below link

MS no. 451 onwards

    
 

 

Source : WELCOME TO RDSO CMS Team Last Reviewed on: 15-05-2025  

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