Railway Engineering
Vertical curves are provided where algebraic difference between grades is equal to or

less than 2 mm/m
more than 2 mm/m
less than 4 mm/m
more than 4mm/m

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Railway Engineering
A triangle is used for

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

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