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Bridge & Structure

Role of the Directorate

  • Issue of Standard drawings for Railway Bridges (Steel, Composite, PSC and RCC), Road Over Bridges (Composite and Bow String), Foot Over Bridges, Steel bridge sleepers etc.
  • Formulation and updation of codes, manuals & guidelines on various aspects related to bridge loading, design, planning, construction etc
  • Clearance of Design Basis Report of Metros and Non-standard important railway bridges.
  • Vetting of Speed Certificates for different rolling stocks from bridge point of view for facilitating trials and operation of new rolling stocks.
  • Development & adoption of new technology for bridges on Indian Railways is done for induction of new technology.
  • Registration of vendors for Steel girder fabrication, elastomeric bearings, POT-PTFE bearings, expansion joints and HSFG bolting assemblies is done for quality assurance during fabrication of bridges.
  • Fabrication inspection of newly fabricated steel bridge girders where RDSO is engaged as an inspecting agency by Zonal Railways is done to ensure quality fabrication of these steel girders.
  • Rail Structure Interaction (RSI) analysis for ballasted deck bridges for Zonal Railways  for continuation of LWR/CWR over such bridges.
  • NDT Testing and instrumentation is conducted on bridges referred by Zonal Railways.
  • Bridge and Structures Standard Committee Meetings are conducted for discussion and finalization of various technical issues related to bridges over Indian Railways.
  • Development of new loading standards and dealing issues related to floods. Bridge related Consultancy services to Zonal Railways are also one of the major task.


Organizational Chart


Brief Achievements of the Directorate during last one year and current year

  1. Checking of suitability of existing RDSO standard ROB drawings of 18m, 24m, 30m and 36m for skew angle > 20° and upto 30°.
  2. Vetting of 388 speed certificates and 88 Nos. trial reports of different types of  rolling stocks from bridge point of view.
  3. Approval of 78 vendors of Steel Bridge Girder, Elastomeric Bearing, POT-PTFE Bearing, Expansion Joints and HSFG bolts.
  4. “Guidelines of approval of Design Basis Report for Important Bridges (Revision-1)” Report No. BS-122 (R1), has been revised and issued to Zonal Railway.
  5. Compendium work for RCC Box RUBs completed. This will help field engineers in planning, designing & executing of RUBs over Indian Railways.
  6. Technical approval of instrumentation schemes for 20 Nos. bridges (1 of NER, 14 of CR, 4 of ECR and 1 of SECR).
  7. The design and drawings of 6m wide FOB for span 25m to 30m with main girder as composite girders, tubular sections for columns and roofing arrangements and dog legged ramps were issued.
  8. Drawings of 42m clear span for NHAI two lane one way (four lane), bow string girder has been revised due to revision in IRC SP:84 and issued (RDSO/B-10437 to 10437/11).
  9. Revision of RDSO standard ROB drawings of 18, 24m, 30 m & 36m  for revised deck widths as per latest IRC specification
  10. Drawing of 91.4m OWG has been revised to accommodate spherical bearing and issued vide Drg. No. RDSO/B-17184/9.
  11. Standard design and drawings of RCC (M-35) Abutments of height 4m and more than 4m & up to 6m for span 12.2m Post Tensioned PSC slab (4units) for severe environment exposure condition conforming to 25t Loading-2008 for seismic zone V have been issued to Zonal Railways.
  12. Standard Quality Assurance Plan (QAP) for Elastomeric Bearing, POT-PTFE Bearing and Expansion Joint has been issued in Feb.2023.
  13. Standard design of RCC (M-35) Abutments of height 4m and more than 4m & up to 6m for span 12.2m Post Tensioned PSC slab (4units) for severe environment exposure condition conforming to 25t Loading-2008 for seismic zones II, III & IV.
  14. Standard design of 12m width FOB for span 25 to 30m for Amrit Bharat Station Scheme &   1 in 8 ramp were issued.
  15. Standard design of V shaped columns and 1 in 8 straight ramp for 12m FOB were issued.
  16. Revision of Plate Girder Drawings of Railway Bridges as per IRS Seismic Code, Revised (2020).
  17. Guidelines for suitability of existing bridges (Composite/RCC/PSC Super-Structure) designed to BGML, RBG and MBG-1987 loading for running 25t loading-2008 at 100kmph on DFC Feeder Routes and 25t identified routes issued.
  18. Revised drawings RDSO/B-10275R series and drawing RDSO/B-10275/4 (ALT.-1) of elastomeric bearing for 12.2 m post tensioned U girder for 25t 2008 loading issued.
  19. Drawing of Signal Gantry for four tracks issued.
  20. Standard Drawing of RCC Box Pushing using Protection Plate Arrangement RDSO/B-10161 & RDSO/B-10161/1 issued.
  21. Revised Design/Drawings series for 18.3m span PSC U Girder (Post Tensioned) of 25t 2008 loading issued.
  22. Guideline for pipe-pushing by micro-tunneling has been issued to Zonal Railways in Sept 2023. 
  23. 87th BSC meeting was conducted successfully on 29th – 30th September 2023 at Srinagar.
  24. A&C Slip No. 39 to IRBM regarding modification in Para 1107 (7) (h) and A&C Slip No. 40 regarding modification in Para 604 has been issued.
  25. Standard design of LTE/Kavach towers for 3 legged Lattice tower and Monopole tower for 180 kmph wind speed for revised EPA (12-15 Sqm) has been issued.
  26. Revised guidelines for integrity testing of piles (BS-41 R1) issued.
  27. Guidelines for Clearance of Rolling Stock on Railway Bridges(BS-135) issued.
  28. A&C Slip No. 10 to IRS Concrete Bridge Code regarding Accidental impact load & load consideration for fatigue issued.
  29. Low height (125mm) H-Beam sleeper for flange width more than 450 mm, suitable for all standard loading issued.
  30. Revision of Design & Drawings of 30.5m Composite girder for DFC loading as per latest IRS seismic code has been issued.
  31. Revision of Design & Drawings of 24.4m plate girder for DFC loading as per latest IRS seismic code has been issued.
  32. Design of LTE/Kavach Lattice tower for 15 EPA, suitable for 180 Kmph wind speed for cyclonic region has been issued.
  33. Design Basis Report for Bridge no. 31 of Northern Railway across river Yamuna has been approved.

Current Assignment in hand

  1. Standardization of design of drawings of 1 span of Open Web Girders with ballasted deck for 25-t loading with its suitability for passenger train operation upto 220kmph.
  2. Research Project with CSIR-SERC on “Evaluation and management of longitudinal forces on substructure of Railway Bridges”
  3. Upgradation of B&S Lab.
  4. Detailed checking of all standard drawings of Concrete girders including bearings /slabs for 25t loading.
  5. Dynamic analysis and evaluation of existing RDSO standard bridge superstructures for various axle load and speed configurations.
  6. Preparation of Appreciation Report for field trials of Continuous Scour Monitoring of Bridge Foundation.
  7. TAG on Vasai Creek Bridge of WR.
  8. Issue of draft A&C slip no 10 of IRS Bridge Substructures and Foundation Code.
  9. Review of Manual on Design and Construction of Well and Pile Foundation.
  10. Revision of RDSO Standard Bow string girder ROB drawings of 72m clear span for NHAI two lane one way (four lane) revised deck widths as per latest IRC specifications.
  11. TAG on Manjhi Bridge (Bridge No. 16) of NER
  12. Revision of RDSO Standard design of PSC ‘U’ slab/girder.
  13. Development of RDSO Standard Bolted Bow string girder ROB drawings of 48 m clear span for NHAI two lane one way (four lane) revised deck widths as per latest IRC specifications.
  14. Revision of report no. BS-123.
  15. Development of RDSO Standard Bow string girder ROB drawings of 48m clear span bolted type two lane one way (four lane) with revised deck widths as per latest IRC specifications.
  16. Revision of RDSO Standard PCC pier drawings no. BA-10337, BA-10339, RDSO/B-10345, 10347 & 10349/R corresponding to A&C Slip No.7 of IRS Bridge Substructure and foundation code.
  17. Structural checking of design of 12m wide FOB for 15 to 20 m span under Amrit BHARAT scheme.
  18. Revision of design of Composite girders and Plate girders for DFC loading as per latest IRS seismic code (2020).
  19. Development of arrangement for passing of service cable on open web girder.
  20. Development of arrangement for inspection of top chord on open web girder.


Source : WELCOME TO RDSO CMS Team Last Reviewed on: 21-03-2024  

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