721. Before attempting to line the switches of a crossover equipped with center locking device, the ground lever, located between rails at center of crossover, must be operated to unlock the hand-throw switch stands at each end of the crossover.

    721-A. When the crossover switches have been restored to normal position, the ground lever at center of crossover must be operated to again lock the switch stands.

Use of Electrically-Locked Switches

Speed Limit Signs