Railway Engineering
When semaphore and warner are installed on the same post, then the stop indication is given when

None of these
both semaphore and warner arms lowered
both arms are horizontal
semaphore arm lowered but warner arm horizontal

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Railway Engineering
Stretcher bar is provided

To prevent any vertical movement between the wing rail and nose of crossing
To maintain the two tongue rails at the exact distance
To permit lateral movement of the tongue rail
To ensure exact gauge at the toe of the switch as well as the nose of crossing

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