Railway Engineering
A treadle bar is used for

setting marshalling yard signals
interlocking points and signal
setting points and crossings
track maintenance

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Railway Engineering
Switch angle is the angle between

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

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