Section 236.203 - Hand operated crossover between main tracks; protectionAt hand-operated crossover between main tracks, protection shall be provided by one of the following:
(a) An arrangement of one or more track circuits and switch circuit controllers,(b) Facing point locks on both switches of the crossover, with both locks operated by a single lever, or(c) Electric locking of the switches of the crossover. Signals governing movements over either switch shall display their most restrictive aspect when any of the following conditions exist: (1) Where protection is provided by one or more track circuits and switch circuit controllers, and either switch is open or the crossover is occupied by a train, locomotive or car in such a manner as to foul the main track. It shall not be a violation of this requirement where the presence of sand, rust, dirt, grease or other foreign matter on the rail prevents effective shunting;(2) Where facing point locks with a single lever are provided, and either switch is unlocked;(3) Where the switches are electrically locked, before the electric locking releases.