---
kind: "section"
citation: "49 C.F.R. § 299.313"
title: "49"
number: "299.313"
heading: "Track geometry; performance based."
url: "https://uscodex.org/cfr/49/299.313"
---

# §299.313. Track geometry; performance based.

- (a) For all track of Class H4 and above, vibration in the lateral and vertical directions measured on the carbody of a vehicle representative of the service fleet traveling at a speed no less than 10 km/h (6.2 mph) below the maximum speed permitted for the class of track, shall not exceed the limits prescribed in the following table:
- (b) If the carbody acceleration requirements are not met on a segment of track, the segment of track is to be reclassified to the next lower Class of track for which it does meet the requirements of this part.

## Notes

### 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: 85 FR 69731, Nov. 3, 2020, unless otherwise noted.