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EXTRACTS FROM

SCHEDULE OF DIMENSIONS-1676 mm (5 ft. 6 in.) GAUGE

(Reprint 1973)

(Including correction slip no. 2,4 & 11)

SCHEDULE I

1676 mm. (5 ft.6 in.) GAUGE

The DIMENSIONS given in the Schedule 1 are to be observed on new works, or alterations to existing works, on all 1676 mm. (5 ft. 6 in.) Gauge Railways in India, unless prior sanction has been obtained from the Railway Board through The Commissioner of Railway safety to execute works which wi11 infringe the Schedule.

Dimensions recommended by the Railway Board are given in Schedule II.

List of infringements of Schedule I that may be permitted on existing railways is given in Schedule III.

CHAPTER I-GENERAL

[See diagram numbers 1A, 1A(modified), 1B and 1C]

Note:

Item 8and 10 are applicable only to structures outside station yards. All other items are of general applicability.

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  Spacing of tracks  
1 . Minimum distance center to center of tracks 4265 mm
  Note-
  • See Appendix for extra clearance required on curves.
  • For spacing of tracks in tunnels, through and semi through girder bridges, see Item 13(i).
 
  Rails-  
4. Minimum clearance of check rails for a curve 44 mm
6. Minimum depth of space for wheel flange from rail level 38 mm
  Building & Structures  
7. Minimum horizontal distance from center of track to any structure From rail level to 305 mm (1 ft) above rail level 1675 mm
8. Minimum horizontal distance from center of track to any structure except a platform from 305 mm. above rail level to 4420 mm. above rail level 2135 mm
  N0TE
  • Under items 7 and 8 any material stacked by the side of a line is to be considered a structure in the sense in which the word is here used. Item 7 & 8 also apply to projection of rock etc.from the side of a cutting.
  • See Appendix for extra clearance required on curve.
  • Light structures such as ladders thin posts etc.- erected alongside the track at a distance of less than 236Omm from the center of adjacent track should be blanked to a height of 300 mm between 2060 mmand 2360 mm above rail level.
 
9. Minimum horizontal distance of any telegraph post measured from the center of, and at right angles to the nearest track The height of the post plus 2135 mm
  Note
  • When the line is in cutting a telegraph post erected outside the cutting, must be at a distance from edge of the cutting not less than the total height of the post.
  • Post carrying signal or communication wires may, with the sanction of the Railway Administration be located in accordance with Item 11 (iii) provided that the conditions of the rule are ensured by adequate construction and strong guying or other methods.
 
10. (i) Minimum height above rail level for a distance of 915 mm on either side of the center of track for overhead structures 4875 mm
(iii) Where 25 kV AC traction is likely to be used, the minimum height above rail level for a distance of 1600 mm on either side of the center shall be :  
  (a) Light over-head structure such an foot-over bridges 6250 mm
  (b) Heavy overhead structure such as road-over or flyover bridges 5870 mm
  Note –
  • See Appendix for extra clearance required on curves.
  • In case of existing structures, a special study shall be made as indicated in appendix A to Chapter V-A before 25 kV AC traction is introduced.
  • If any turnout or cross-over is located under a structure or within 15 m.from its center, the minimum height of such a structure shall be 6250 mm.
  • The heights mentioned against item 10(i) to 10(iii) shall be measured from the higher or Super-elevated rail.
 
11. Minimum height above rail level of the lowest portion of any conductor crossing a railway, other than telegraph, telephone and other such low tension wires or a traction trolley wire under conditions of maximum sag shall be :  
  up to and including 650 Volts Above 650 volts upto and including 33000 volts Above 33000 volts upto and including 66000 volts Above 660000 volts upto and including 110000 volts Above 110000 volts upto and including 165000 volts Above 165000

volts

Outside Station Limits 7160 mm 7620 mm 7920 mm 8230 mm 8530 mm 8840 mm
Inside Station Limits :            
Unearthed neutral
9600mm
10060 mm 10360 mm 10670 mm 10970 mm 111280 mm
Earthed neutral
7160 mm
10060 mm 10360 mm 10670 mm 10970 mm 111280 mm
(ii) Minimum height above rail level to the lowest wire of any ortion of a guard or guard cradle under conditions of maximum sag 6860 mm
(iii) The minimum horizontal distance measured at right angles to and from the center of the nearest track to any part of a rigid and well founded post, its fitting and projections carrying Electrical Conductors:  
  (a) from rail level to 305 mm above rail level 1675 mm
  (b) from 305 mm above rail level to 4420 mm above rail level 2135 mm
  Note –  
  (a) Any post which is so constructed or guyed as to remain in a vertical position, or failing this to continue to provide the clearances specified above, with one or all of the conductors broken or, with its conductors attached, when subjected to maximum wind pressures, may be considered to be a "Rigid and well founded post"  
  (b) See Appendix for extra clearance required on curves.  
(iv) Minimum clearance between any conductor not adequately insulated and any railway structure under most adverse conditions :
  • upto and including 650 volts
2440 mm
(v) Minimum height above rail level for telegraph, telephone and other such low tension wires crossing a railway 6100 mm
  Interlocking and Signal Gear  
12. Maximum height above rail level of any part of interlocking or signal gear for a width of 1600 mm or 183Omm in the case of Tunnels, through and Semi-through girder bridges on either side of center of track subject to the restriction embodied in the note(a) below 64 mm
  Note –

(a) For a distance of 229 mm outside and 14Omm 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 attained by the wheels or wing rails and point rails of special crossings leading to snag dead ends, or check rails of diamond crossings.

(b) Signal wires or supports for signal wires may be allowed at not less than 1600 mm or 183Omm in the case of Tunnels or through or semi-through girder bridges -(See note to Item 33 of chapter IV(A)- on either side of the center of track provided that they are not more than 203 mm above rail level.

c) 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 and Semi-through Girder Bridges:

(See Diagram No 1-A and 1-A(Modified).

 
13. (i) minimum distance center to center of tracks 4725 mm
  Note- When respacing existing lines, the minimum distance center to center of track may be reduced from 4725 mm to not less than 4495 mm for the purpose of avoiding heavy alterations to tunnels or through or semi-through girder bridges. The 4725 mm dimension is to be adopted forall new works.  
(ii) Minimum horizontal distance from center of track to any structure shall be as follows: -  
  Height above rail level Horizontal distance fromcenter of track  
  (a) From 0 to 305 mm 1905 mm  
  (b) From 305 mm to 1065 mm 1905 mm increasing to 2360  
  (c) From 1065 mm to 3355 mm 2360 mm  
  (d) From 3355 mm to 4420 mm 2360 mm decreasing to 2135  
  (e) From 4420 to 5870 mm 2135 mm. decreasing to 915  
  Note-  
  (a) Where electric traction is not likely to be used, Overhead bracing or bridges may, be 5030 mm above rail level for a distance of 1370 mm on either side of the center of track  
  (b) In case of existing structures a special study shall be made as indicated in Appendix-A to Chapter V-A before 25 kV AC traction is introduced.  
  (c) See Appendix for extra clearances required on curves.