---
kind: "section"
citation: "49 C.F.R. § 236.5"
title: "49"
number: "236.5"
heading: "Design of control circuits on closed circuit principle."
url: "https://uscodex.org/cfr/49/236.5"
---

# §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.


## Notes

### Authority

Authority: 49 U.S.C. 20102-20103, 20107, 20133, 20141, 20157, 20301-20303, 20306, 20501-20505, 20701-20703, 21301-21302, 21304; 28 U.S.C. 2461 note; and 49 CFR 1.89.

### Source

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