Railway Engineering
The object of providing a point lock is

to detect any obstruction between and tongue rail
to ensure that the point may not be operated while the train is on it
None of these
to ensure that each switch is correctly set

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Railway Engineering
A triangle is used for

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

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