---
kind: "section"
citation: "49 C.F.R. § 236.503"
title: "49"
number: "236.503"
heading: "Automatic brake application; initiation when predetermined rate of speed exceeded."
url: "https://uscodex.org/cfr/49/236.503"
---

# §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.


## 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.