---
kind: "section"
citation: "49 C.F.R. § 236.513"
title: "49"
number: "236.513"
heading: "Audible indicator."
url: "https://uscodex.org/cfr/49/236.513"
---

# §236.513. Audible indicator.

- (a) The automatic cab signal system shall be so arranged that when the cab signal changes to display a more restrictive aspect, an audible indicator will sound continuously until silenced by manual operation of an acknowledging device.
- (b) The audible cab indicator of automatic cab signal, automatic train stop, or automatic train control system shall have a distinctive sound and be clearly audible throughout the cab under all operating conditions.

## Notes

### Amendments

[49 FR 3386, Jan. 26, 1984]

### 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.

### Amendments

[49 FR 3386, Jan. 26, 1984]