StacksVerified U.S. regulatory reference

49 CFR §236.509

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The automatic train stop, train control or cab signal apparatus shall be arranged so that when two or more locomotives are coupled, or a pushing or helping locomotive is used, it can be made operative only on the locomotive from which the brakes are controlled.