Page 59 - IRSEM_Main Book

Rail Section A B C D L
52 KG’s 156 136 67 15.5 38.82
60 KG’s 172 150 74.3 16.5 37.5
90 R 112.83 136.5 66.68 13.89 32.53

4.1 A Tongue Rail Is Classified As Worn Out When

(a) Chipped/cracked over small lengths totaling to 200 mm within 1000 mm from the toe.
Chipped length is the portion where tongue rail has worn out for a depth of more than
10mm over a continuous length of 10 mm.
(b) Developed a knife edged tip — thickness of tip less than 2 mm over a length of more
than 100 mm anywhere up to a distance of 1000 mm from its toe.
(c) Badly twisted, does not house properly and cause a gap of more than 5 mm at the toe.
(d) Vertical wear which is measured at a point where tongue and stock rails are at the same
level. Vertical wear allowed is 8 mm for 60 kg. Lateral wear is 8 mm for 60 kg.
(e) Burred stock rail to be replaced.
(f) Tongue rails should bear evenly on all the slide chairs.
(g) All sleepers should be packed properly.
(h) When the tongue rail is in closed position, it must bear evenly against distance studs or
blocks.
(i) Wear on switches can be reduced by lubrication of the gauge face of the tongue rail.
(j) On wooden sleeper layout assembly, the slide chairs should be fixed to the timbers by
plate screws. Round spikes not to be used for this purpose.

4.2 Measurement And Reading – Track And Vehicle

(i) Track Readings At Accident Site. Gauge should be checked at the following locations in
case of points and crossings.
 305 mm (1 foot) in advance of nose of tongue rail.
 152 mm inside nose of tongue rail for straight and turn out.
 At middle of tongue rail for straight & turnout.
 At heel of tongue rail for straight & turnout.

Note: Gauge should be correct at all locations except at toe. At toe, for PSC layouts up to
3 mm tight gauge is allowed.

(ii) Gauge at Crossings
 610 (2 feet) in advance of nose of crossing on straight & T/Out
 152 mm behind the nose of crossing on straight & T/Out
 76 mm behind the nose of crossing on straight & T/Out.
The gauge should be correct.
(iii) Check rail (Wing Rail) Clearance on Crossings:
 BG 44 to 48 mm
 MG 41 to 44 mm
Ensure checkrail clearance should be between the values mentioned above.
(iv) Measure vertical wear of stock and tongue rails.
Maximum permissible vertical wear on wing rails or nose of crossings: 10 mm

Chapter 3: Duties Of Signal Supervisors And Technical Staff Page 37 of 535