Railway Engineering
Switch angle is the angle between

the gauge face of the stock rail and outer face of the tongue rail
the gauge face of the stock rail and tongue rail
the outer face of the stock rail and the gauge face of the tongue rail
the outer face of the stock rail and tongue rail

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Railway Engineering
The treadle bar is provided

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
at right angle to the rail
near and parallel to inner side of both the rails

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