49 CFR §236.767
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Electric locking, effective when a train passes a signal displaying an aspect for it to proceed, which prevents the movement of any switch, movable-point frog, or derail in advance of the train within the route entered. It may be so arranged that as a train clears a track section of the route, the locking affecting that section is released.