Railway Engineering
Composite sleeper index is the index of

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

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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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