Railway Engineering
The main function of a fish plate is

To join rails with the sleeper
To allow rail to expand and contract freely
None of these
To join the two rails together

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Railway Engineering
Switch angle is the angle between

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

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