Indian Railway Dimensions Quiz
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Questions and Answers

What is the maximum distance apart of trolley refuges on bridges with main spans of less than 100m?

  • 150m
  • 50m
  • 100m (correct)
  • 200m

    • What is the minimum formation width in embankment for new works on double line straight track?

  • 13160mm (correct)
  • 7850mm
  • 12150mm
  • 11550mm

    • When constructing on curves, how much extra width is required for single line formations due to the additional ballast?

  • 50mm
  • 150mm (correct)
  • 100mm
  • 200mm

    • What is the minimum formation width for an existing single line track in cutting?

    <p>6250mm</p> Signup and view all the answers

    What is the reason for increasing the formation width on double line curves?

    <p>Effect of super-elevation</p> Signup and view all the answers

    What do 'Existing works' refer to in the context of this schedule?

    <p>Works that were present before the issuance of the Indian Railway Schedule of Dimensions (BG), Revised-2004</p> Signup and view all the answers

    Which of the following does NOT fall under 'New works'?

    <p>Extending siding on an existing line</p> Signup and view all the answers

    For new works, what is the minimum center-to-center distance required for straight tracks?

    <p>5300mm</p> Signup and view all the answers

    What is required in addition to the basic clearance for running EMU and 3660mm stock on existing works?

    <p>Clearances prescribed in specific items of Chapter I</p> Signup and view all the answers

    Which authority can condone infringement of provisions stated in Schedule I?

    <p>Commissioner</p> Signup and view all the answers

    What is the implication of infringement beyond the dimensions prescribed in Schedule II?

    <p>Sanction for condonation must be obtained from Railway Board</p> Signup and view all the answers

    Which items are specifically applicable only to structures outside station yards?

    <p>Items 8 and 10</p> Signup and view all the answers

    What additional considerations are made for spacing of tracks in tunnels?

    <p>Extra clearances as required on curves must be adhered to</p> Signup and view all the answers

    What is the minimum height required above rail level for a light overhead structure?

    <p>6250mm</p> Signup and view all the answers

    What is the minimum height required for heavy overhead structures when 25 kV A.C. traction is introduced?

    <p>5070mm</p> Signup and view all the answers

    If a turnout is located under a heavy overhead structure, what is the minimum height required?

    <p>6250mm</p> Signup and view all the answers

    What is the extra allowance that must be made for future raising of the track?

    <p>275mm</p> Signup and view all the answers

    In cases of restricted height of existing structures, what is the minimum height for a heavy overhead structure?

    <p>5270mm</p> Signup and view all the answers

    What is the height requirement for light overhead structures if they are restricted due to existing structures?

    <p>5270mm</p> Signup and view all the answers

    What is the specified minimum height for an overhead structure located within 40m of a turnout when 25 kV A.C. traction is used?

    <p>6250mm</p> Signup and view all the answers

    Which of the following describes the height measurement for overhead structures?

    <p>From the super elevated rail</p> Signup and view all the answers

    What happens if any crossover is under a heavy overhead structure and located within 40 meters from its face?

    <p>Height requirement is 6250mm</p> Signup and view all the answers

    What kind of study is required if there's a restricted height due to existing structures when introducing 25 kV A.C. traction?

    <p>A special assessment must be conducted</p> Signup and view all the answers

    What is the minimum horizontal distance from the center of the track to a structure when the height above rail level is between 0.0mm and 305mm?

    <p>1905mm</p> Signup and view all the answers

    What minimum distance is required at center-to-center for new works and alterations to existing works?

    <p>4725mm</p> Signup and view all the answers

    What is the maximum height above rail level that allows for a consistent horizontal distance of 2360mm from the center of the track?

    <p>3355mm</p> Signup and view all the answers

    If electric traction is not likely to be utilized, how high can over-head bracing of bridges be above rail level for a certain distance?

    <p>5030mm</p> Signup and view all the answers

    What is the minimum horizontal distance from the center of the track to any structure for heights between 3355mm and 4420mm?

    <p>2360mm</p> Signup and view all the answers

    Which clearance is applicable for existing structures before introducing electric traction?

    <p>Clearance will be determined by Electrical Inspector</p> Signup and view all the answers

    In the case of D.C. traction in use, what is the adjusted minimum horizontal distance from 4420mm to 5410mm?

    <p>2135mm decreasing to 915mm</p> Signup and view all the answers

    What is the minimum distance from the center of the track to a structure for heights taller than 4410mm but shorter than 5870mm?

    <p>2135mm decreasing to 915mm</p> Signup and view all the answers

    For existing lines, what is the required minimum center-to-center distance?

    <p>4495mm</p> Signup and view all the answers

    What additional clearances are required on curves according to the standards?

    <p>Clearances are determined case by case</p> Signup and view all the answers

    What is the minimum horizontal clearance required from the centre of the nearest track for a rigid well founded post/structure when its conductors are broken?

    <p>2.135m</p> Signup and view all the answers

    How often must existing rigid well founded post/structures be inspected by the railway's nominated electrical official?

    <p>Once a year</p> Signup and view all the answers

    What is the maximum height above rail level for interlocking or signal gear?

    <p>64mm</p> Signup and view all the answers

    What additional height must be accounted for in the minimum horizontal distance for non-rigid structures above ground level?

    <p>2.135m</p> Signup and view all the answers

    What restriction applies to gear or track fittings within 229mm outside and 140mm inside the gauge faces of the rail?

    <p>They must not project above rail level</p> Signup and view all the answers

    What is the minimum clearance allowed for signal wires over rail level near interlocking and signal gear?

    <p>203mm</p> Signup and view all the answers

    For structures that are within the distance range of existing rigid well founded post/structures, what condition applies?

    <p>They must be inspected and certified</p> Signup and view all the answers

    What is the width limitation for interlocking or signal gear considering tunnel or semi-through girder bridges?

    <p>1600mm</p> Signup and view all the answers

    If a post/structure is not considered rigid and well founded, what is the basis for determining the minimum horizontal distance required?

    <p>Height of the post/structure plus 2.135m</p> Signup and view all the answers

    What must be kept as appropriate records during the inspection of existing rigid well founded post/structures?

    <p>Inspection reports</p> Signup and view all the answers

    What is the minimum horizontal distance from the center of the track to any structure when the height above rail level is between 305mm and 1065mm?

    <p>1905mm increasing to 2360mm</p> Signup and view all the answers

    Which of the following conditions affects the minimum height of overhead structures when electric traction is not likely to be used?

    <p>The bracing height can be a maximum of 5030mm over a restricted distance.</p> Signup and view all the answers

    For existing structures, what must be completed before introducing electric traction?

    <p>A special clearance study accepted by the Electrical Inspector of the Railways.</p> Signup and view all the answers

    What is the significance of a minimum horizontal distance of 2360mm decreasing to 2135mm?

    <p>It represents structures between 3355mm and 4420mm in terms of overhead clearance.</p> Signup and view all the answers

    What modification is required for D.C. traction in relation to the minimum horizontal distance from the center of track for heights between 4420mm and 5410mm?

    <p>It decreases from 2135mm to 915mm.</p> Signup and view all the answers

    What is the maximum clear distance allowed between two consecutive sleepers on existing bridges where there is nothing solid between them?

    <p>510mm</p> Signup and view all the answers

    Which of the following is the minimum radius of curves required for construction?

    <p>175m</p> Signup and view all the answers

    What is the minimum height required for bridge sleepers resting directly on longitudinal girders?

    <p>150mm</p> Signup and view all the answers

    What is the prescribed minimum distance between joint sleepers on new constructions?

    <p>200mm</p> Signup and view all the answers

    In which scenario can a lesser center-to-center distance than 5300mm be provided on approaches?

    <p>In the case of tunnels, ROBs, and flyovers</p> Signup and view all the answers

    What is the considered minimum length for bridge sleepers greater than the distance outside girder flanges?

    <p>2440mm</p> Signup and view all the answers

    What is the impact of providing new running loops regarding existing works?

    <p>It is classified as new work.</p> Signup and view all the answers

    What happens if the center-to-center distance between tracks is less than 5300mm?

    <p>A gradual increase is allowed on approaches.</p> Signup and view all the answers

    What is the minimum height above rail level for a heavy overhead structure if a turnout is located within 40m of the structure when 25 kV A.C. traction is introduced?

    <p>6250mm</p> Signup and view all the answers

    What is the maximum allowable height for rolling stock under Foot Over Bridges in Mumbai Suburban?

    <p>4420 mm</p> Signup and view all the answers

    What extra allowance must be made for track raising when introducing 25 kV A.C. traction?

    <p>275mm</p> Signup and view all the answers

    Which condition must be met for reducing the height of Foot Over Bridges to 5750 mm?

    <p>A study to ascertain the feasibility of 4800 mm contact wire height is conducted.</p> Signup and view all the answers

    In the case of restricted height of existing structures, what is the minimum height required for light overhead structures?

    <p>5270mm</p> Signup and view all the answers

    Which of the following does NOT affect the minimum height requirement for overhead structures?

    <p>The height of adjacent buildings</p> Signup and view all the answers

    For power line crossings above 132kV and up to 220kV, what is the minimum clearance from rail level?

    <p>12660 mm</p> Signup and view all the answers

    When measuring the height of overhead structures, what is the reference level used?

    <p>The higher or super elevated rail</p> Signup and view all the answers

    What is the minimum clearance required for power line crossings with a voltage above 400kV?

    <p>19160 mm</p> Signup and view all the answers

    What is the minimum height required for a heavy overhead structure if it is located beyond 40m from the nearest turnout when 25 kV A.C. traction is introduced?

    <p>5870mm</p> Signup and view all the answers

    What stipulation is made about crossovers in relation to Foot Over Bridges?

    <p>There must be no crossover below FOB or within 40 m from its face.</p> Signup and view all the answers

    What is the required minimum height for the contact wire in the specified conditions?

    <p>4800 mm</p> Signup and view all the answers

    Which specification must be adhered to when existing structures have a restricted height?

    <p>The minimum height should not be lower than specified limits based on structure type</p> Signup and view all the answers

    For a light overhead structure in areas where traction is likely to be used, what is the minimum height required?

    <p>6250mm</p> Signup and view all the answers

    For electric traction, what is the height related allowance for signals or interlocking gear?

    <p>3050 mm</p> Signup and view all the answers

    What is the tallest permissible height for a heavy overhead structure under strict clearance regulations?

    <p>6250mm</p> Signup and view all the answers

    Which feature is NOT allowed within 520 m from the face of a Foot Over Bridge?

    <p>Level crossing</p> Signup and view all the answers

    Why is a special study required when assessing the height of the contact wire?

    <p>To ascertain the feasibility of maintaining a minimum height of 4800 mm.</p> Signup and view all the answers

    Which additional consideration is necessary for overhead equipment when lines are electrified on a 25 kV A.C. system?

    <p>Longer traction overhead equipment masts may be needed</p> Signup and view all the answers

    What is the minimum clearance for a power line crossing up to and including 11kV?

    <p>Not applicable, must be underground</p> Signup and view all the answers

    What is the minimum clearance required between any conductor not adequately insulated and a railway structure for voltages above 220 kV and up to and including 400 kV?

    <p>7300 mm</p> Signup and view all the answers

    Which of the following is the minimum height above rail level for low tension wires crossing a railway?

    <p>6100 mm</p> Signup and view all the answers

    When a crossing is provided with guarding, what is the minimum clearance that must be maintained between the bottom of the guard wire and the highest traction conductor?

    <p>2000 mm</p> Signup and view all the answers

    What is the required horizontal distance from the nearest track to any part of the structure above ground level carrying electrical conductors for new structures?

    <p>(H + 6) m</p> Signup and view all the answers

    What is the minimum clearance required for a conductor not adequately insulated for voltages above 165 kV and up to and including 220 kV?

    <p>5500 mm</p> Signup and view all the answers

    Which voltage range requires a minimum clearance of 3700 mm from any conductor to railway structures?

    <p>Above 650 volts and upto &amp; including 33 kV</p> Signup and view all the answers

    In the context of existing power line crossings for electrification works, which column is NOT applicable for dimensions?

    <p>Column (3)</p> Signup and view all the answers

    What is the minimum clearance required for voltages above 500 kV and up to and including 800 kV?

    <p>10900 mm</p> Signup and view all the answers

    For existing rigid well founded post/structures, what is the minimum horizontal distance if the structure is 3 meters away from the nearest track?

    <p>3 m away from the toe of embankment</p> Signup and view all the answers

    Study Notes

    General

    • Dimensions are classified for "Existing works" and "New works"
    • Existing works are works that were completed before the Indian Railway Schedule of Dimensions (BG) Revised-2004, released in 2004.
    • New works include new constructions, additions to existing lines, new structures, gauge conversion and doubling.
    • Alterations such as shifting of a Points and Crossings, extension of siding, extension of loop line, alteration in building etc., are not considered new works.
    • With the exception of existing works, all dimensions must be observed on 1676mm gauge on Indian Railways.
    • Any infringement on IRSOD Chapter I, II, III, V, VA & VB of Schedule I can be condoned by the Commissioner, provided that for infringement beyond dimensions prescribed in Schedule II, if any, or wherever specific mentions appear in Schedule I, sanction for condonation shall be obtained from Railway Board through Commissioner/Chief Commissioner of Railway Safety.

    Spacing of Tracks

    • For existing works, minimum distance center to center of straight tracks is 4265mm.
    • For new works/additions to existing works, minimum distance center to center of straight tracks is 5300mm.

    Overhead Structures

    • For areas where 25 kV A.C. traction is likely to be used, the minimum height above rail level for a distance of 1600mm on either side of the center of track should be:
      • 6250mm for light overhead structures such as Foot Over Bridges
      • 5870mm for heavy overhead structures such as Road Over Bridges and Flyovers
    • In case of restricted height of existing structures, a special study shall be made before 25 kV A.C. traction is introduced.
    • In areas where 25 kV A.C. traction is used or likely to be used, If any turnout or crossover is located under a heavy overhead structure or within 40m from its nearest face, irrespective of the position of level crossing gate, the minimum height of such overhead structure shall be 6250mm.
    • The height mentioned against items 10(a), 10(b) & 10(c) above shall be measured from the higher or super elevated rail.
    • On lines, existing or proposed to be electrified on 25kV A.C.system, necessary provision shall be made in overhead structure and overhead equipment to permit an extra allowance of 275mm for raising of track in future to cater for modern track structure in the form of increased ballast cushion, larger sleeper thickness and deeper rail sections.

    Rigid Well Founded Post/Structure

    • Any post/structure which is so constructed or guyed as to remain in a vertical position, or failing this to continue to provide the minimum horizontal clearances of 2.135m from the centre of nearest track, with one or all of the conductors broken or with its conductors attached, when subjected to maximum wind pressure, shall be considered to be a “rigid well founded post/structure”.
    • Existing rigid well founded post/structures, presently at a distance equal to or more than (ii) as given above, but less than (H+2.135)m, shall be inspected by railway’s nominated electrical official once in a year jointly with the owner of the post/structure and certify the safety of the structure, keeping appropriate records of inspections.

    Interlocking and Signal Gear

    • Maximum height above rail level of any part of interlocking or signal gear is 64mm for a width of 1600mm or 1830mm in the case of tunnels, through and semi-through girder bridges on either side of centre of track.
    • For a distance of 229 mm outside and 140mm inside the gauge faces of the rail, no gear or track fittings must project above rail level except such parts as are required to be actuated by the wheels or wing rails and point rails of special crossings leading to snag dead ends or elevated check rails of crossing or check rails/check flats of diamond crossings.
    • Signal wires or supports for signal wires may be allowed at not less than 1600 mm or 1830mm in the case of tunnels or through or semi-through girder bridges on either side of the centre of track provided that they are not more than 203mm above rail level.
    • Metal covers with ramps on both sides must be provided over all interlocking gear projecting above rail level between the rails of a track to prevent hanging couplings from damaging the gear.

    Tunnels, Through Girder Bridges and Semi-Through Girder Bridges

    • Minimum distance at centre to centre of track:
      • For existing lines: 4495mm
      • For new works and alterations to existing works: 4725mm
    • Minimum horizontal distance from centre of track to any structure:
      • From 0.0mm to 305mm: 1905mm
      • From 305mm to 1065mm: 1905mm increasing to 2360mm
      • From 1065mm to 3355mm: 2360mm
      • From 3355mm to 4420mm: 2360mm decreasing to 2135mm
      • From 4420mm to 5870mm: 2135mm decreasing to 915mm

    Safety Refuges

    • Maximum distance apart of refuges in tunnels is 100m
    • Maximum distance apart of trolley refuges is:
      • 100m on bridges with main spans of less than 100m
      • A refuge over each pier on bridges with main spans of 100m or more

    Formation Width

    • Minimum formation width for single line straight track:

      • For existing works:
        • 6850mm in embankment
        • 6250mm in cutting (excluding side drains)
      • For new works/alteration to existing works:
        • 7850mm in embankment
        • 7850mm in cutting (excluding side drains)

    • Minimum formation width for double line straight track is:

      • For existing works:
        • 12150mm in embankment
        • 11550mm in cutting (excluding side drains)
      • For new works/alteration to existing works:
        • 13160mm in embankment
        • 13160mm in cutting (excluding side drains)

    • Minimum formation width is based on:

      • Ballast section having 1.5:1 side slope.
      • Cross slope on top of formation of 1 in 30.
      • Track center in case of double line section is 5300 mm

    • Formation width on curves:

      • On curves, the actual width to be provided should take into account 150mm extra widening of ballast shoulder (500mm in place of 350mm) required on the outer side of curves.
      • Due to requirement of extra clearances on double line on curves, increase in track centre with corresponding increase in formation width would be necessary to take into account the effect of super-elevation.

    Track Layout Requirements

    • Minimum center-to-center distance between tracks on new works and alterations is 5300mm.
    • Existing tracks with less than 5300mm center-to-center distance can have the same lesser distance on approaches to facilitate a gradual increase to 5300mm.
    • OHE masts and signal posts are not preferred in between tracks, but if unavoidable, clearances must be increased.
    • Bridges should comply with Chapter IV of the Railways opening for the Public carriage of Passengers, Rule 2000.

    Curves and Bridges

    • Minimum radius of curves is 175m (10 degrees).
    • Clear distance between sleepers on bridges should not exceed 510mm.
    • Bridge sleepers resting directly on longitudinal girders should not be less than 150mm deep and 305mm longer than the distance between girder flanges, with a minimum of 2440mm.

    Overhead Structure Clearances for Electrified Lines

    • Minimum height above rail level for a distance of 1600mm on either side of the track:
      • Light overhead structures (Foot Over Bridges): 6250mm
      • Heavy overhead structures (Road Over Bridges and Flyovers): 5870mm
    • In areas where 25 kV A.C. traction is used or likely to be used, if any turnout or crossover is located under a heavy overhead structure or within 40m from its nearest face, the minimum height of such overhead structure shall be 6250mm*. In case the turnout is beyond 40m; but the level crossing gate is within 520m from the nearest face of the bridge, the height of such overhead structure shall be 6250mm*.
    • On lines, existing or proposed to be electrified on a 25kV A.C.system, necessary provision shall be made in the overhead structure and overhead equipment by using longer traction overhead equipment masts to permit an extra allowance of 275mm for raising of track in future to cater for modern track structure in the form of increased ballast cushion, larger sleeper thickness and deeper rail sections.* In case of restricted height of existing heavy overhead structure, minimum height above rail level shall not be lower than 5270mm, adhering to the provisions of note (b) above.

    Power Line Crossings

    • Minimum clearances from rail level for power line crossings in non-electrified and electrified territory:
      • Upto and including 11kV: Normally by underground cable
      • Above 11kV & upto 33kV: 10860mm (existing) / 14660mm (new)
      • Above 33kV & upto 66kV: 11160mm (existing) / 14960mm (new)
      • Above 66kV & upto 132kV: 11760mm (existing) / 15560mm (new)
      • Above 132kV & upto 220kV: 12660mm (existing) / 16460mm (new)
      • Above 220kV & upto 400kV: 14460mm (existing) / 18260mm (new)
      • Above 400kV & upto 500kV: 15360mm (existing) / 19160mm (new)
      • Above 500kV & upto 800kV: 18060mm (existing) / 21860mm (new)
    • Power line crossings in yards and stations area shall be avoided.

    Minimum Clearance for Structures

    • Minimum horizontal distance measured at right-angle to, and from the centre of nearest track to any part of the structure above ground level, carrying electrical conductor crossing a railway line shall be:
      • For new structures: (H+6) m, where ‘H’ is the height of the post/structure from nearest ground level
      • For existing rigid well-founded post/structures: 3m, or 1.5m away from the toe of embankment/top of cutting, whichever is more

    Tunnels, Through Girder Bridges, and Semi-Through Girder Bridges

    • Minimum centre-to-centre distance of track:
      • For existing lines: 4495mm
      • For new works and alterations to existing works: 4725mm
    • Minimum horizontal distances from the centre of track to any structure:
      • From 0.0mm to 305mm: 1905mm
      • From 305mm to 1065mm: 1905mm increasing to 2360mm
      • From 1065mm to 3355mm: 2360mm
      • From 3355mm to 4420mm: 2360mm decreasing to 2135mm
      • From 4420mm to 5870mm: 2135mm decreasing to 915mm
    • Tunnels, through girder and semi through girder bridges outside station yards should be treated as heavy overhead structures for electrification works and the same dimensions as mentioned in note (c) at para 10 above shall be applicable and OHE arrangement shall be as per RDSO Drawings.

    Important Notes

    • All height/clearances are in mm and under maximum sag conditions.
    • Metal covers with ramps on both sides must be provided over all interlocking gear projecting above rail level between the rails of a track to prevent hanging couplings from damaging the gear.
    • Special clearance studies are required in cases of restricted height of existing structures or when electric traction is introduced.

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    Description

    Test your knowledge on the dimensions related to existing and new works in Indian Railways. This quiz covers the classification of works, spacing of tracks, and the regulations outlined in the IRSOD. Perfect for railway professionals and enthusiasts wanting to brush up on their knowledge.

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