---
kind: "section"
citation: "49 C.F.R. § 238.227"
title: "49"
number: "238.227"
heading: "Suspension system."
url: "https://uscodex.org/cfr/49/238.227"
---

# §238.227. Suspension system.


On or after November 8, 1999—

- (a) All passenger equipment shall exhibit freedom from truck hunting at all operating speeds. If truck hunting does occur, a railroad shall immediately take appropriate action to prevent derailment. Truck hunting is defined in [§ 213.333](/cfr/49/213.333.md) of this chapter.
- (b) Nothing in this section shall affect the requirements of the Track Safety Standards in [part 213](/cfr/49/part213.md) of this chapter as they apply to passenger equipment as provided in that part. In particular—
  - (1) **Pre-revenue service qualification.** All passenger equipment intended for service at speeds greater than 90 mph or at any curving speed producing more than 5 inches of cant deficiency shall demonstrate safe operation during pre-revenue service qualification in accordance with [§ 213.345](/cfr/49/213.345.md) of this chapter and is subject to the requirements of either [§ 213.57](/cfr/49/213.57.md) or [§ 213.329](/cfr/49/213.329.md) of this chapter, as appropriate.
  - (2) **Revenue service operation.** All passenger equipment intended for service at speeds greater than 90 mph or at any curving speed producing more than 5 inches of cant deficiency is subject to the requirements of [§ 213.333](/cfr/49/213.333.md) of this chapter and either [§ 213.57](/cfr/49/213.57.md) or [§ 213.329](/cfr/49/213.329.md) of this chapter, as appropriate.

## Notes

### Amendments

[78 FR 16125, Mar. 13, 2013]

### Authority

Authority: 49 U.S.C. 20103, 20107, 20133, 20141, 20302-20303, 20306, 20701-20702, 21301-21302, 21304; 28 U.S.C. 2461 note; and 49 CFR 1.89.

### Source

Source: 64 FR 25660, May 12, 1999, unless otherwise noted.

### Amendments

[78 FR 16125, Mar. 13, 2013]