IRSOD Incorporated PDF 18-28 - Railway Station Yard Design

CHAPTER II--- STATION YARDS (See Diagram No. 2) Note: (1) The expression "in station" as mentioned in Diagram No. 2 is to be interpreted in accordance with the definition of "station limits" given in chapter I, part I, of t...

CHAPTER II--- STATION YARDS (See Diagram No. 2) Note: (1) The expression "in station" as mentioned in Diagram No. 2 is to be interpreted in accordance with the definition of "station limits" given in chapter I, part I, of the General Rules for open lines, viz "station limits" means the portion of a railway which is under the control of a station master and is situated between the outermost signals of the station. (2) For running EMU and other 3660 mm stock, clearances prescribed in item 13(i)(a) and (ii) of chapter I "Tunnel, through and semi-through girder bridges" shall also be required for all structures governed by items 1(i) and 11(A) of this chapter and not only for tunnels and through and semi through girder bridges. However, a platform shelter may infringe item 13(ii) (e) of chapter I and edge of the platform shelter may be kept at a minimum horizontal distance of 1600 mm from centre line of track and at a minimum height of 4610mm above rail level. Spacing of tracks:- 1 Minimum distance centre to centre on straight tracks (i) For existing works 4265mm (ii) For new works/ addition to existing works 5300mm Note: a) See Appendix for ‘extra clearance required on curves’. b) In case new OHE masts/Signal posts are required to be provided in between tracks under unavoidable circumstances, the clearance maintained in 1(ii) above shall be increased by equal to the width of such provisions/structures/foundations, as the case may be. c) For “New Works/additions to existing works such as conversion of existing loop lines into main line, laying of new loop lines and/or shifting of existing lines etc” in the existing yard, if the stipulation mentioned in 1(ii) and Note (b) above are not likely to be achieved due to existing field constraints, then minimum horizontal distance from center of track to any structure, as mentioned in Note (c) of para 11(B) of Chapter-II, IRSOD-2022 shall be ensured. d) In completely new yard or portion of existing yard, where “New Work” is being done independent of the existing yard, stipulation under 1(ii) above shall be ensured. e) In case of tunnels, ROBs, flyovers, through & semi-through girder bridges, where centre to centre distance lesser than 5300mm has been provided, lesser centre to centre distance can be provided on approaches also up to adequate distance to facilitate gradual increase in centre to centre distance up to 5300mm. 2 Maximum (Steepest) gradient in station yards – Maximum (Steepest) gradient in station yards, unless special safety devices are adopted and/or special rules enforced to prevent accidents in accordance with approved special instructions. (i) For New Works & Alteration to Existing Works- (a) Recommended : 1 in 1200 (0.083%) (b) Maximum (Steepest) : 1 in 400 (0.25%) (ii) For Existing works : 1 in 400 (0.25%) 10  (g) In case of “New Lines” projects, the above provisions shall also apply to Flag station, Halt station, or class ‘C’ station (where there is no station section as defined in IR General Rules, 1976). This is to keep provision for conversion of Flag, Halt, or class ‘C’ station into class ‘A’ or ‘B’ station in future. (h) For other than ‘New Lines’ projects, the above provisions shall not be applicable for Flag station, Halt station, or class ‘C’ station. Platforms: 3 (i) Horizontal distance from centre of track to face of passenger platform coping Maximum 1680mm Minimum 1670mm Note : (i) The coping of passenger platform must be so constructed that when necessary, to allow for introduction of wider stock, it can be easily and expeditiously set back to 1905 mm. from centre of track (see diagram no. 2) (ii) Horizontal distance from centre of track to face of goods platform coping Maximum 1680mm Minimum 1670mm iii) Horizontal distance from centre of track to face of any platform wall. Maximum 1905 mm Minimum 1675 mm Note: (a) New platform walls should be built to maximum dimensions and the coping corbelled out to 1675mm unless provision is made to allow for the introduction of wider rolling stock either by slewing the platform track out by 230 mm or by moving the platform wall 230 mm farther from the track. (b) See Appendix for extra clearance required on curves. 4 Height above rail level for high passenger platforms 840mm maximum 760mm minimum 5 Maximum Height above rail level for medium level passenger platform 455mm 6 Maximum height above rail level for goods platforms (except horse 1065mm and end loading platforms) Note: For items 4, 5 and 6 (a) Platforms may be flush with rail level. (b) The ends of all platforms (except end loading platforms) must be ramped to a slope of 1 in 6 for a width of not less than 1 m from the face of the platform wall, the rest can either be ramped to the same slope or fenced. (c) The height of platforms serving canted track should be measured vertically from the face to a plane passing through the top of both the rails. 12  (d) End loading platforms and platforms on sidings used exclusively for horse loading may be raised to a height of 1295mm above rail level. (e) Signal wires or supports for signal wires may be allowed underneath the platform coping. (f) The length of a passenger platform should be not less than the length of the longest passenger train excluding the engine, booked to stop at the platform. (g) No passenger platform in case of new line, would be constructed on a curve having radius less than 875m. (h) In case of construction of a new platform on the existing line addition/alteration to existing platforms or in gauge conversion/doubling works, where either the new platform(s) are to be constructed or the old being dismantled and reconstructed, efforts should be made to ease out the existing curves having radii less than 875 m. However, for these works, having platform located/to be located on curves with radii less than 875 m, no condonation of CRS/Board would be necessary. (i) For Item 4: the height for Mumbai suburban passenger platform and Pune suburban passenger platform may be in range of 840mm-900mm for reducing gap between bottom of sole bar of EMU coach & platform floor and shall be applicable for operation of EMU stocks having height of bottom of sole bar above rail level not less than 1039mm above rail level in fully loaded condition. The height of platform more than 840mm shall be permitted by General Manager, after ensuring maintenance condition of track and maintenance condition of rolling stock as under: a. Improvement in maintenance practices and monitoring condition of spring during trip inspection of EMU rakes. b. Improvement in track maintenance on platform lines to the standards specified in Para 522 of IRPWM - 2020. c. Improved monitoring and corrective action to control sinkage of vertical level of track. d. In case, a new design EMU stock, different from the existing stock is to be introduced on suburban section, running trial over increased height suburban platforms shall be required before clearing the stock for passenger operation. Buildings and structures: 7 (a) Minimum horizontal distance of any building/structure on a passenger platform from centre line of track: (i) From platform level to 305mm above platform level 5180mm increasing uniformly to 5330mm (ii) From 305mm above platform level to 3430mm above 5330mm rail level (iii) From 3430mm above rail level to (a) 4115mm above rail level in case of existing works 5330mm decreasing uniformly to 3810mm (b) 4610mm above rail level in case of new works or 5330mm decreasing alterations to existing works uniformly to 3810mm 13 Note: (1) For the return end of platform fencing these dimensions may be reduced to 2740mm. (2) Isolated structures are covered in Item 8 below. (3) In Mumbai suburban area, when it is not possible to provide platform width to meet provisions at 7(a) (i), 7(a) (ii) and 7(a) (iii) above, the dimensions at 7(a) (i), 7(a) (ii) and 7(a) (iii) can be reduced by Commissioner of Railway Safety for construction of new foot over bridge on the platform, on case to case basis subject to stipulations (a), (b), (c) & (d) below, as under: (i) From platform level to 3430mm above rail level 4115 mm (ii) From 3430mm above rail level to 4610mm above rail level 4115 mm decreasing uniformly to 3810mm (a) The supporting column of FOB deck and landing on platform shall be designed in such a way that there is no lateral bracing between two columns up to a height of 2400 mm from platform level to allow free movement of passengers. (b) The FOB structure as well as platform surface in the 'entire zone covering the members of FOB having horizontal clearance less than 5330 mm from centerline of track from PF level to 2400 mm above PF level' shall be painted with yellow and red retro reflective paint strips to alert the alighting passengers. No temporary or permanent structure, no stabling of hand trolley shall be permitted in this zone. This area shall be well illuminated during night time. (c) No Slewing of track towards adjoining platform shall be permitted in the FOB zone. (d) In any case, FOB landing width should not be more than 50% of Platform width. 7 (b) Minimum horizontal distance of any building or longitudinal boundary fence from the centre line of track of passenger platform which is not an island platform (for new works or alterations to existing works): (i) Minimum 6830mm (ii) Recommended 12130mm Note: (a) Item 7(b) (ii) allows for setting back the platform to make room for an additional track in future, without infringing item 7(b) (i). (b) Item 7(b) should also apply to buildings and isolated structures not readily removable, erected on ground over which it is anticipated that a platform may be extended in future. (c) Item 7(b) (i) may be reduced to 5330mm in case of foot over bridge at any station and/or provision of longitudinal boundary fence at ‘D’, ’E’ and ‘F’ category stations; subject to stipulation that if any other pucca construction of building/structure is done in future, provisions of Item 7(a) & 7(b) shall be followed. (d) In Mumbai suburban section, for construction of new foot over bridge on the platform, provision of item 7(a) shall be applicable. 14 8 Minimum horizontal distance from centre line of track to a pillar, column, lamp or similar isolated structure on a passenger platform or any building on a goods platform. (i) From platform level to 305mm above platform level 4570mm increasing uniformly to 4720mm (ii) From 305mm above platform level to 3705mm above rail level 4720mm (iii) From 3705mm above rail level to (a) 4115mm above rail level in case of existing works 4720mm decreasing uniformly to 3810mm (b) 4610mm above rail level in case of new works or 4720mm decreasing alterations to existing works uniformly to 3810mm 8A. Minimum horizontal distance from centre line of track to a pillar, column, lamp or similar isolated structure on goods platforms: (i) From platform level to 305mm above platform level 3960mm increasing uniformly to 4110mm (ii) From 305mm above platform level to (a) 3980mm above rail level in case of existing works 4110mm (b) 4310mm above rail level in case of new works or alterations to existing works 4110mm (iii) (a) From 3980mm above rail level to 4115mm above rail level 4110mm decreasing in case of existing works uniformly to 3810mm (b) From 4310mm above rail level to 4610mm above rail 4110mm decreasing level in case of new works or alteration to existing works uniformly to 3810mm Note: A pillar or column (vide items 8 & 8A) which covers more than 3716 sq.cm in plan, must be classed as "building" and not as " isolated structure". 9 Minimum height above rail level for a width of 1600mm on either side of the 6250mm centre of track, of tie rods or any continuous covering in a passenger station Note: (1) On lines other than main lines where 25 kV A.C. electric traction is not likely to be used, the dimensions given above may be modified as under: For a width of 1370mm on either side of centre of track: 6100mm (2) On existing primary lines, not likely to be electrified, dimension as in Note (1) may be allowed to Continue 15  (3) Item 9 does not apply to over head piping parallel to the track. (4) A low roof that infringes item 9 is permissible in the case of goods or transshipment shed on a siding, provided it does not infringe the outline of the figures for the minimum fixed structure out of stations (see diagram 1B). (5) Extra vertical clearance of 275mm under over head structures and overhead equipment in electrified section be provided to allow for any raising of track to permit modern track structure to be introduced. Note: On lines proposed to be electrified on 25 kV A.C system, necessary provision should be made in overline structures and overhead equipment if necessary by using longer traction overhead equipment masts to permit possible raising of the track by 275mm in future to cater for increased ballast cushion, larger sleeper thickness and deeper rail sections. 10 Height of Over Head Structures – Minimum height above rail level for a width of 1600mm on either side of 6250mm centre of track, of a foot over bridge or a signal gantry in a passenger station Note: (a) Where D.C. traction is in use or likely to be used, this minimum height shall be 5410mm. (b) On secondary lines, where electric traction is not likely to be introduced, this minimum height shall be 4875mm. This also applies to overhead piping arrangements parallel to track wherever provided, which shall necessarily be changed over to the ground hydrants, when the section is electrified. (c) However, for existing overhead structure, dimensions given in note (c) of para 10 of Chapter-I, Schedule -1: General shall be applicable. (d) Tunnel, through girder bridge and semi-through girder bridge in station yards shall be treated as heavy over head structures, such as ROB for electrification works and the same dimensions as mentioned in note (c) of para 10 of schedule 1, chapter -1 : General shall be applicable. (e) For Mumbai Suburban, the height of Foot Over Bridges mentioned above may be reduced to 5750mm subject to following conditions: (i) The minimum height of the contact wire shall be 4800 mm. (ii) A special study shall be conducted as indicated in appendix A of chapter V-A to ascertain the feasibility of the contact wire height as 4800mm. (iii) There shall be no crossover below FOB or within 40 m from the face of FOB. (iv) There shall be no level crossing within 520 m from face of FOB. (v) The maximum height of rolling stock shall be restricted to 4420 mm. 16  (vi) The height shall be measured from the higher or super-elevated rail. 11 Minimum Horizontal Distance from centre of track to any structure: (A) For existing works: (i) From rail level to 305mm above rail level 1675mm (ii) From 305mm to 3355mm above rail level 2135mm (iii) From 3355mm to 4115mm above rail level 2135mm decreasing to 1980mm (iv) From 4115mm to 6250mm above rail level 1600mm (v) Below the rail level and up to formation level of the track on 2575mm straight and curves up to radius of 875m (vi) Below the rail level and upto the formation level of the track on 2725mm curves with radius less than 875m Note: a) See appendix for ‘extra clearances required on curves’. b) On lines other than main lines or existing main lines, where electric traction is not likely to be introduced, the horizontal distance of 1370mm for height from 4115mm to 6100mm above rail level may be allowed to continue. c) The various fixtures, which are attached to the track like lock bar, point machine, traction bonds, point and signal rodding etc. and are required to be fitted with the rail, can be provided and the clearance, as mentioned in item (v) and (vi) above will not be applicable to these items. d) In case of electrification works in existing yards, no foundation/mast/signal post/any other structure shall be provided between two tracks. In case it is inescapable, the minimum distance of edge of foundation/mast/signal post/any other structure at and above formation level upto rail level from centre of track, shall be 2360mm on straight track & on curve having radius 875m & more and 2510mm in case of curve having radius less than 875m. e) Items (v) and (vi) above shall not be applicable in case of bridges, tunnels and ballastless track (including washable apron). (B) For New Works or Alteration to Existing works: (i) From rail level to 305mm above rail level 1905mm (ii) From 305mm to 1065mm above rail level 1905mm increasing to 2360mm (iii) From 1065mm to 3735mm above rail level 2360mm (iv) From 3735mm to 4420mm above rail level 2360mm decreasing to 2135mm (v) From 4420mm to 4610mm above rail level 2135mm decreasing to 1980mm (vi) From 4610mm to 6250mm above rail level 1600mm 17  (vii) Below the rail level and upto formation level of the track on straight and curves upto radius of 875m 2575mm (viii) Below the rail level and upto the formation level of the track on curves with radius less than 875m. 2725mm Note: (a) See Appendix for ‘extra clearances required on curves’. (b) Items (vii) & (viii) above shall not be applicable in case of bridges, tunnels, ballastless track (including washable apron). (c) For addition/alteration to works in existing yard the minimum horizontal distance shall be maintained as 2360mm on straight track and on curve having radius 875m & more, and 2510mm in case of curve having radius less than 875m, if it is difficult to provide prescribed clearances as mentioned in items (vii) and (viii) above due to existing field constraints. (d) The various fixtures which are attached to the track like traction bonds etc. and are required to be fitted with the rail can be provided and the clearance as mentioned in item (vii) and (viii) above will not be applicable to these fixtures. Points and crossings: 12 Maximum clearance of check rail opposite nose of crossing 48mm Note: In case of turnouts laid with 1673mm gauge, the clearance shall be 45mm instead of 48mm. 13 Minimum clearance of check rail opposite nose of crossing 44mm Note: In case of turnouts laid with 1673mm gauge, the clearance shall be 41mm instead of 44mm 14 Maximum clearance of wing rail at nose of crossing 48mm Note: In case of turnouts laid with 1673mm gauge, the clearance shall be 45mm instead of 48mm 15 Minimum clearance of wing rail at nose of crossing 44mm Note: In case of turnouts laid with 1673mm gauge, the clearance shall be 41mm instead of 44mm. 16 Minimum clearance between toe of open switch and stock rail (i) For existing works 95mm (ii) For new works or alterations to existing works 115mm Note: The clearance can be increased upto 160mm in curved switches in order to obtain adequate clearance between gauge face of stock rail and back face of tongue rail. 17 Minimum radius of curvature for slip points, turnouts 218 m (8 degree) or crossover roads Note: In special cases mentioned below this may be reduced to not less than the minimum of i) 213m radius in case of 1 in 8.5 BG turnouts with 6.4m overriding switch, and ii) 175m radius in case of 1 in 8.5 scissors crossing to allow for sufficient straight over the diamond crossing between crossovers. 18 18 Minimum angle of crossing (ordinary) 1 in 16 Note: Crossings as flat as 1 in 20 will usually be sanctioned if recommended by the Commissioner of Railway Safety. 19 Diamond crossings not to be flatter than 1 in 8.5 Note: Diamond crossings as flat as 1 in 10 will usually be sanctioned if recommended by the Commissioner of Railway Safety. 20 Minimum length of tongue rail 3660mm 21 Minimum length of train protection, point locking or fouling treadle bar 12800mm Note: There must be no change of super elevation (of outer over inner rail) between points 18m outside toe of switch rail and nose of crossing respectively, except in the case of special crossings leading to snag dead-ends or under circumstances as provided for in item– 22. 22 Superelevation and speed in stations on curves with turnouts of contrary and similar flexure: Main line: Subject to the permissible run through speed, based on the standard of interlocking, the equilibrium superelevation, calculated for the speed of the fastest train, may be reduced by a maximum amount of 75mm without reducing the speed on the mainline. Turnouts: i) Curves of contrary flexure:- The equilibrium superelevation in millimeters should be calculated by the formula C = GV2 / 127R Where G = Gauge of track + width of rail head in mm V = Speed in kmph R = Radius in m C = Superelevation in mm The permissible negative superelevation on the turnout (which is also the actual superelevation of the main line) may then be made as (75-C)mm. ii) Curves of similar flexure:- The question of reduction or otherwise of super-elevation on the mainline must necessarily be determined by the administration concerned. In the case of a reverse curve close behind the crossing of the turnouts, the superelevation may be run out at the maximum of 1mm in 360mm. Length of sidings: 23 Minimum clear available length of one siding at any station where it is intended to cross trains:- 19 i) Shall be length of longest train permitted in the section plus 35m ii) Although it may not be necessary till traffic develops to provide sidings for the largest possible train loads, land should be acquired for them and no building, level crossings or other obstructions should be permitted that will interfere with the crossing siding being lengthened to the following dimensions:- On sections of the railways where the Ruling Minimum clear available length of one siding for gradient is new work or alterations to existing works 1 in 100 or flatter 750 m Steeper than 1 in 100 Length of the longest train permitted in the section plus 35 m Note: Clear Available length denotes: (i) Distance between foot of the signal to Fouling Mark in the rear on the same line in case of Main line and Directional Loop at station yard. (ii) In case of Common Loop at the stations, Clear Available Length/Clear Standing Length shall be the distance between two starter signals of opposite direction on the same line. 20