StacksVerified U.S. regulatory reference

49 CFR §236.508

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 so arranged as not to interfere with the application of the brakes by means of the brake valve and not to impair the efficiency of the brake system.