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SN
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MS No.
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Description
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Date
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File No.
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422.
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RDSO/2016/EL/MS/0451(Rev.0)
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Modification sheet for provision of 2 Nos. of oil free compressors of 1750 LPM each onboard mounting in WAP-4 class of Electric Locomotives with modified cab fed by 180 KVA SIV.
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25.04.2016
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EL/3.2.15/Oil free
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423.
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RDSO/2016/EL/MS/0452(Rev.0)
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To overcome the failure of K-8 contactor of Battery charger of M/s Siemens make 180 KVA Static Converter
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29.04.2016
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EL/1.2.9.1(SIE)
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424.
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RDSO/2016/EL/MS/0453(Rev.0)
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Modification to improve intensity level of beam head light in conventional Locomotives.
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29.04.2016
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EL/6.11.1
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425.
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RDSO/2016/EL/MS/0454(Rev.0)
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Provision of Top operated handle for CBC in place of bottom operated.
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29.04.2016
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EL/3.2.119(CBC)
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426. |
RDSO/2016/EL/MS/0455(Rev.0)
Attached Drawing no. SKEL_5011 to 5018 Alt_0
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Modification to brake lever for WAG9/9H Electric locomotives to improve reliability and ensure interchangeability.
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22.12.2016 |
EL/3.2.119/3-ph TBU
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427. |
RDSO/2017/EL/MS/0456(Rev.0)
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Modification in drawing of supporting ring to achieve adequate ’C’ clearance in MSU assembly of 6FRA-6068 TM in WAG9/WAP7 class of locomotives
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09.01.2017
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EL/1.3.10/3
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428. |
RDSO/2017/EL/MS/0457(Rev.0)
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Modification in cooling circuit of M/s BHEL make IGBT based traction converter to prevent air locking, spillage of coolant and fluctuation in coolant level.
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12.01.2017
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EL/3.35.17
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429. |
RDSO/2017/EL/MS/0458(Rev.0)
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Adoption of IGBT type speed sensors in locomotives with GTO based traction converter
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07.02.2017
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EL/11.5.5/1
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430. |
RDSO/2017/EL/MS/0459(Rev.0)
Un-signed copy of Annexure I and II for better legibility
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Modification in three phase electric locomotives provided with MICAS based VCUs to ensure complete redundancy of FLG-1/2, HBB-1/2 processors cards.
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05.05.2017
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EL/11.5.5/4
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431. |
RDSO/2017/EL/MS/0460(Rev.0)
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Modification in drawing of bearing cap NDE to achieve adequate lateral thrust in Traction motor(TM) assembly of 6FRA6068 TM in WAG9/ WAP7 class of locomotives.
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12.06.2017
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EL/3.2.182
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432. |
RDSO/2017/EL/MS/0461 (Rev 0)
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Modification for providing dummy plate in cab roof in place of Air Conditioning unit.; |
23.08.2017 |
EL/3.1.10/2 |
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433. |
RDSO/2017/EL/MS/0462 (Rev 0) |
Provision of Disc type coupling in Main compressor of 1000 LPM capacity in place of resilent coupling. |
08.09.2017 |
EL/3.2.15(Main) |
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434. |
RDSO/2017/EL/MS/0463 (Rev 0) |
Provsion of Trap chamber for collecting coal/dust particles coming from BP pipe in A9-BP circuit in conventional electric locomotives. |
08.09.2017 |
EL/3.2.19(G) |
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435. |
RDSO/2017/EL/MS/0464 (Rev 0)
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Provision of auxiliary interlock for monitoring of A2-B2 system of Harmonic filter ON (8.1)/adoption (8.2) contactor in GTO/IGBT based locomotives.
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25.09.2017
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EL/3.1.35/2 (Elect)
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436. |
RDSO/2017/EL/MS/0465 (Rev 0)
Amendment-1 of MS no. 465 dated 04.04.2018
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Modification in three phase electric locomotives for:
a. Provision of Trap Chamber for collecting coal/dust particles coming from BP Train Pipe during emergency brake application.
b. Replacing KBIL make ‘NB-11 valve’ (size 01”) of CCB 2.0 system with FTRTIL make ‘Emergency Exhaust valve’ (size 11/4”) of E-70 system or similar design Emergency exhaust valve.
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18.10.2017
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EL/3.2.19/3-phase
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437. |
RDSO/2017/EL/MS/0466 (Rev 0) |
Modification in drawing of Outer bearing cap DE to achieve adequate lateral thrust in Traction motor(TM) assembly of 6FRA6068 TM in WAG9/WAP7 class of locomotives.
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15.11.2017 |
EL/3.2.182 |
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438. |
RDSO/2017/EL/MS/0467 (Rev 0) |
Reliability improvement in blocking diodes of three phase electric locomotives.
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07.12.2017 |
EL/3.1.35/2/Elect |
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439. |
RDSO/2018/EL/MS/0468 (Rev 0) |
Modification in existing hotel load scheme by removing irrelevent protections provided in WAP-7 locomotives. |
06.02.2018 |
EL/11.5.5/6 |
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440. |
RDSO/2018/EL/MS/0469 (Rev 0)
Encl. 1, 4 & 8, 2, 3, 5, 6, 7
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Modification for providing cab AC unit in Electric Locomotives by Zonal Railways.
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08.05.2018 |
EL/3.1.10/2 |
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441. |
RDSO/2018/EL/MS/0470 (Rev 0) |
Provision of LED type light for exchanging signals with train passing staffs
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18.06.2018
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EL/0.1.3/Driver
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442. |
RDSO/2018/EL/MS/0471 (Rev 0) |
Modification in the bottom plate of M/s Schneider make Single bottle VCBs
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24.10.2018
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EL/3.2.61/3 |
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443. |
RDSO/2018/EL/MS/0472 (Rev 0) |
Modification in Hex. Socket CSK Head Screws for fixing of Traction motor Bellow plate to achieve adequate mechanical strength in Traction motor (TM) type 6FRA6068 for WAG9/WAP7 class of locomotives. |
20.08.2018
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EL/3.2.85 |
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444. |
RDSO/2018/EL/MS/0473 (Rev 0) |
Conversion of GTO based locomotive into IGBT based 3-phase electric locomotives.
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11.09.2018
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EL/3.1.35/17 |
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445. |
RDSO/2018/EL/MS/0475 (Rev.'0')
RDSO/2018/EL/MS/0475 (Rev.'1')
RDSO/2018/EL/MS/0475 (Rev.'2')
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Modification in the existing Control Electronics (CE) resetting scheme of 3-phase electric locomotives.
Modification in the existing Control Electronics (CE) resetting scheme to reset the control electronics(VCU) in Multiple unit locos.
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12.12.2018
26.10.2023
21.11.2024
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EL/11.5.5/21
EL/11.5.5/21
EL/3.1.35.17
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446. |
RDSO/2019/EL/MS/0476 (Rev 0) |
Modification in Mounting arrangement of Leather Bellows of Traction Motors type 6FRA6068.
(This Supersedes Modification sheet no. RDSO/2009/ELRS/MS/0373 (Rev ‘1’) amendment-3 dated 04.04.2014 & RDSO/2009/ELRS/MS/0374 (Rev ‘1’) amendment-3 dated 04.04.2014)
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22.01.2019 |
EL/3.2.85 |
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447. |
RDSO/2019/EL/MS/0477 (Rev 0) |
Operations of WAP-5/WAP-7 in push pull
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18.06.2019 |
EL/3.1.35/4 |
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448. |
RDSO/2019/EL/MS/0478 (Rev 0) |
Adoption of Traction motor labyrinths of TM type 6FRA6068 as per original dimensions given by ABB to eliminate problem of gear case oil ingress in TM.
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30.07.2019 |
EL/3.2.182 |
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449. |
RDSO/2019/EL/MS/0480 (Rev 0) |
Modification in earth fault circuit for elimination of spurious message on account of earthing of control cables in 3-phase locomotives.
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05.12.2019 |
EL/3.1.35/2/Elect |
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450 |
RDSO/2024/EL/MS/0482(Rev 1)
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Scheme for energy saving in three phase freight locomotives. |
10.04.2024
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EL/3.1.35.17 |
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451 |
RDSO/2021/EL/MS/0483 (Rev 0) |
Modification in vertical damper fixing Arrangement of WAP-7/WAG-9 locomotives. |
25.08.2021 |
EL/3.2.119(Damper) |
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452 |
RDSO/2022/EL/MS/0484 (Rev 0) |
Modification in underslung compressor mounting legs at Electric Locomotives. |
24.01.2022 |
EL/3.2.119(SS) |
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453 |
RDSO/2022/EL/MS/0485 (Rev 0) |
Issue of Modification Sheet for increasing grease outlet hole on End Frame DE side from 9 mm to 12 mm in Traction motor type 6FRA6068.
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17.03.2022 |
EL/3.2.182 |
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454 |
RDSO/2022/EL/MS/0486 (Rev 0)
RDSO/2024/EL/MS/0486(Rev1)
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Modification to ensure continuity of HOG Converters’ feed to the train from working loco through dead loco in WAP5/WAP7 class of 3-phase HOG compliant electric locomotives.
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21.03.2022
23.02.2024
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EL/11.5.5/6 |
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455 |
RDSO/2022/EL/MS/0487 (Rev 0)
Amendment-1 dated 19.09.2023
Amendment-2 dated 08.08.2025
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Modification Sheet for Development of Traction motor Dropping Detection System (TMDDS) in Conventional Locomotives equipped with Hitachi HS 15250A Traction motors. |
21.05.2022 |
EL/3.2.172 |
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456 |
RDSO/2022/EL/MS/0488 (Rev 0) |
Provision of Blocking Diode in HOG control circuit (in series of MCB 129.2/1) of HOG compliant WAP7&WAP5 Three Phase Electric Locomotives.
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22.07.2022 |
EL/11.5.5/21 |
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457 |
RDSO/2022/EL/MS/0489 (Rev 0) |
Provision of HOG indication lamp in driver desk for HOG ON command from Power car. |
26.07.2022 |
EL/11.5.5/21 |
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458 |
RDSO/2022/EL/MS/0490 (Rev. 0) |
Modification to avoid Speedometer OFF & ON during running of train/locomotive due to VCU reset in three phase electric locomotives. |
09.09.2022
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EL/11.5.5/21 |
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459 |
RDSO/2023/EL/MS/0491 (Rev 0) |
Relocation of RS valve/Emergency Cock for ease of operation by Assistant Loco Pilot (ALP) in 3-Phase Electric Locomotives.
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27.03.2023 |
EL/3.2.19/3-Phase/Pt-1 |
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460 |
RDSO/2023/EL/MS/0492 (Rev 0) |
Provision of Auto Regression Circuit in Tap-changer based Coventional Electric Locomotives for ensuring shunting mode operations. |
19.06.2023 |
EL/2.2.9/10 |
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461 |
RDSO/2023/EL/MS/0493 (Rev 0) |
Provision of Additional safety sling for Traction Link of WAP5/WAP7/WAG9 Locomotives. |
26.07.2023 |
EL/3.1.35/12 |
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462 |
RDSO/2023/EL/MS/0494 (Rev 0) |
Provision of seat for inspecting official in Electric locomotives. |
03.10.2023 |
EL/3.1.22/4 (Cab) |
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463 |
RDSO/2023/EL/MS/0495 (Rev 0) |
Provision of additional BLDJ switch by utilization of BLHO/ZBAN switch as additional BLDJ in three-phase electric locomotives (WAG9/WAP7/WAP5).
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26.10.2023 |
EL/11.5.5/21 |
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464 |
RDSO/2023/EL/MS/0496 (Rev 0) |
Modification Sheet for development of Traction Motor Dropping Detection System (TMDDS) in WAP-7/WAG-9/9H/9HC type of Electric Locomotives.
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01.12.2023 |
EL/3.1.35/2(TMS) |
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465 |
RDSO/2024/EL/MS/0497 (Rev 0) |
Modification Sheet for Power Supply to Real-Time Train Information System (RTIS) devices in Tap-changer based conventional Electric Locomotives & 3-Phase Electric Locomotives
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09.02.2024 |
EL/0.1.3/Driver |
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466 |
RDSO/2024/EL/MS/0498 (Rev 0) |
Recording of Flasher light operation either due to fault or manually by Loco Pilot in case of emergency with time stamping in Conventional Electric Locomotives equipped with Microprocessor based control and fault diagnostic system (Ver-3). |
25.04.2024 |
EL/4.2.15/Gen |
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467 |
RDSO/2024/EL/MS/0499 (Rev 0) |
Provision of two LED indication lamps, LSIP1 in Cab-1 and LSIP2 in Cab-2, in conventional electric locomotives equipped with MPCS Version-3, to indicate the IP coil status (energized/de-energized) in case of DDU failure.
|
19.09.2024 |
EL/4.2.15/Gen |
|
468 |
RDSO/2024/EL/MS/0500 (Rev 0) |
Recording of Flasher light operation either due to fault or manually by Loco Pilot in case of emergency with time stamping in VCU of 3-phase Electric Locomotives. |
13.09.2024 |
EL/3.1.35/17 |
|
469 |
RDSO/2024/EL/MS/0501 (Rev 0) |
Provision of Single 410 mm stud in upper frame articulation bearing joint of High Reach Pantograph type WBL-85 HR (HRPT) of M/s Schunk make on Tap-changer based conventional Electric Locomotives.
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23.12.2024 |
EL/2.2.1/High Reach |
|
470 |
RDSO/2024/EL/MS/0502 (Rev.0) |
Unloader valve control circuit modification in three Phase Electric Locomotives. |
10.10.2024 |
EL/3.2.19/3-Phase/Part-1 |
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471 |
RDSO/2024/EL/MS/0503 (Rev.0) |
Paralleling of interlocks of control circuit contactor to improve reliability of three phase electric locomotives.
|
17.09.2024 |
EL/11.5.5/21 |
|
472 |
RDSO/2024/EL/MS/0504(Rev 1) |
Isolation of Harmonic Filter from 3-phase locomotives fitted with M/s Alstom (BTIPL), CGPISL and Medha make IGBT based Propulsion Equipment.
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23.04.2025 |
EL/3.1.35.17 |
|
473 |
RDSO/2024/EL/MS/0505 (Rev.1) |
Acknowledgment method of VCD through hand operated push button switch to eliminate possibility of rhythmic operation of foot operated switch.
|
25.02.2025 |
EL/11.5.5/21 |
|
474 |
RDSO/2025/EL/MS/0507 (Rev.0) |
Provision of Waterless Urinal in WAG-9/9H/9HC 3-phase electric locomotives. |
25.02.2025 |
EL/3.1.10/1(WLU) |
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475 |
RDSO/2025/EL/MS/0508(Rev 0) |
Provision of wateress urinal in WAP-7 three phase electric locomotives |
23.04.2025 |
EL/3.1.10 (WLU) |
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MS no. 1 to 450
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