---
kind: "section"
citation: "49 C.F.R. § 236.205"
title: "49"
number: "236.205"
heading: "Signal control circuits; requirements."
url: "https://uscodex.org/cfr/49/236.205"
---

# §236.205. Signal control circuits; requirements.


The circuits shall be so installed that each signal governing train movements into a block will display its most restrictive aspect when any of the following conditions obtain within the block:

- (a) Occupancy by a train, locomotive, or car,
- (b) When points of a switch are not closed in proper position,
- (c) When an independently operated fouling point derail equipped with switch circuit controller is not in derailing position,
- (d) When a track relay is in de-energized position or a device which functions as a track relay is in its most restrictive state; or when signal control circuit is deenergized.

## Notes

### Amendments

[33 FR 19684, Dec. 25, 1968, as amended at 49 FR 3385, 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

[33 FR 19684, Dec. 25, 1968, as amended at 49 FR 3385, Jan. 26, 1984]