Railway Engineering
Composite sleeper index is the index of

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

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Railway Engineering
Switch angle is the angle between

the outer face of the stock rail and tongue rail
the gauge face of the stock rail and tongue rail
the gauge face of the stock rail and outer face of the tongue rail
the outer face of the stock rail and the gauge face of the tongue rail

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