An arrangement to prevent the improper operation of a signal, switch, movable-point frog, or derail as the result of a cross in electrical circuits.
49 C.F.R. §236.787
Ramp, see § 236.744 .
An arrangement to prevent the improper operation of a signal, switch, movable-point frog, or derail as the result of a cross in electrical circuits.
49 C.F.R. §236.787
Ramp, see § 236.744 .