Railway Engineering
The main function of a fish plate is

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

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Railway Engineering
A triangle is used for

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

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