Railway Engineering
Composite sleeper index is the index of

Toughness and wear resistance
Wear resistance and hardness
Strength and toughness
Hardness and strength

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Railway Engineering
A triangle is used for

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

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