49 CFR 236.503 - Automatic brake application; initiation when predetermined rate of speed exceeded.

Regulations last checked for updates: Feb 11, 2026

Title 49 - Transportation last revised: Feb 03, 2026

View all text of Subpart E [§ 236.501 - § 236.590]

§ 236.503 - Automatic brake application; initiation when predetermined rate of speed exceeded.

An automatic train control system shall operate to initiate an automatic brake application when the speed of the train exceeds the predetermined rate as required by the setting of the speed control mechanism.

authority: 49 U.S.C. 20102-20103,20107,20133,20141,20157,20301,20306,20501,20701,21301,21304; 28 U.S.C. 2461 note; and 49 CFR 1.89

source: 33 FR 19684, Dec. 25, 1968, unless otherwise noted.

cite as: 49 CFR 236.503