Requirement of Track Material
It is important that the exact
quantities of track material are conveyed to the site. Any excess material gets
wasted, whereas shortage of material results in difficulties and delays in
carrying out renewal work. It is normally desirable to have a small spare stock
of extra material ready in case of unforeseen contingencies.
The exact quantity of material
required for 1 km of track is calculated as given below.
If the track is an ST sleeper
track with 52-kg rails and sleeper density M + 7 (where M is the
length of the rail in metres, which is normally 13 m on BG), then the
calculations are as follows.
Rails
Fish bolts Each joint requires four fish
bolts:
Number of fish bolts = 4 × number
of rails per km = 4 × 154 = 516
Fish plates Each joint requires two
fish plates:
Number of fish plates = 2 ×
number of rails per km = 2 × 154 = 308
Keys Four keys are required per
sleeper:
Number of
keys = 4 × 1540 = 5160
Loose jaws Four loose jaws are required per
sleeper:
Number of
loose jaws = 1540 × 4 = 5160
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