Throw of switch
Throw of switch for BG for new work should be 115mm. If proper stretcher bars are used, such a throw is possible from track structure point of view. The actual amount of throw is provided by point machine. Point machines are designed with maximum stroke of 143mm, to enable throw of 115mm. If less throw of switch is provided, it may pose troubles such as improper bearing of tongue rail against stock rail on one side. On opposite side clearance between the back face of open tongue rail and stock rail gauge face will be inadequate for passage of wheel, hence the wheel may rub against non gauge face of tongue rail which may set tongue rail and the stretcher bars in oscillatory motion. Hence, achieving proper throw of switch is important. For existing work, minimum throw of switch is 95mm.
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