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

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

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Railway Engineering
The treadle bar is provided

at right angle to the rail
near and parallel to inner side of one of the rails
in the middle of the track a little in front of the toes of the tongue rail
near and parallel to inner side of both the rails

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