Rails

The standard length of the rails is 13 m for BG and 12 m for MG lines.

No. of rails per km for BG lines = ¹⁰⁰⁰ x 2

13

= 77 x 2 = 154

Wt of 52-kg rails per km = 52 x 154

= 8008 kg

Number of sleepers

The number of sleepers to be used depends upon the sleeper density. Assume sleeper density to be M + 7, where M is the length of the rail in metres.

Number of sleepers per rail = 13 + 7 = 20 Number of sleepers per km = 77 x 20 = 1540

Fittings and fastenings

(a) No. of fish plates per km = 2 x number of rails per km

= 2 x 154 = 308

(b) No. of fish bolts = 4 x number of rails per km

= 4 x 154 = 616

(c) No. of bearing plates = number of sleepers x 2

= 1540 x 2 = 3080

(iv) Number of dog spikes = number of sleepers x 4

= 1540 x 4 = 6160

The requirement of track materials for MG lines can also be calculated in the same manner.