49 CFR 236.5 - Design of control circuits on closed circuit principle.

Regulations last checked for updates: Dec 18, 2025

Title 49 - Transportation last revised: Nov 03, 2025

View all text of Subpart A [§ 236.1 - § 236.110]

§ 236.5 - Design of control circuits on closed circuit principle.

All control circuits the functioning of which affects safety of train operation shall be designed on the closed circuit principle, except circuits for roadway equipment of intermittent automatic train stop system.

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 236.5