Railway Engineering
If a is the angle of crossing, then the number of crossings ‘N’ according to right angle method is given by

Vi cot(cc/2)
cot(a)
cot(oc/2)
Vi cosec(a/2)

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Railway Engineering
A triangle is used for

Changing the direction of engine
Preventing the vehicles from running off the track
Transferring wagons to and from parallel tracks without shunting
Separating all the sidings and shunting lines from main lines

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