noun
: a mechanical lock for a railroad switch, derail, or movable-point frog comprising a plunger stand and a plunger which engages a lock rod attached to the switch point to lock the operated unit
noun
: a mechanical lock for a railroad switch, derail, or movable-point frog comprising a plunger stand and a plunger which engages a lock rod attached to the switch point to lock the operated unit
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012