Railway Engineering
The correct relation between curve lead (CL), switch lead (SL) and lead of cros¬sing (L) is given by

CL = L – SL
SL = L + CL
L = (CL+SL)/2
L =CL-SL

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Railway Engineering
Switch angle is the angle between

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

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