Railway Engineering
The object of providing a point lock is

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

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Railway Engineering
Heel divergence is

Always less than flange-way clearance
Equal to flange-way clearance
Sometimes greater than flange-way clearance
Always greater than flange-way clearance

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