Railway Engineering
The main function of a fish plate is

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

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Railway Engineering
A triangle is used for

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

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