---
kind: "section"
citation: "49 C.F.R. § 236.502"
title: "49"
number: "236.502"
heading: "Automatic brake application, initiation by restrictive block conditions stopping distance in advance."
url: "https://uscodex.org/cfr/49/236.502"
---

# §236.502. Automatic brake application, initiation by restrictive block conditions stopping distance in advance.


An automatic train-stop or train-control system shall operate to initiate an automatic brake application at least stopping distance from the entrance to a block, wherein any condition described in [§ 236.205](/cfr/49/236.205.md) obtains, and at each main track signal requiring a reduction in speed.


## 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.