49 CFR § 213.323 - Track gage.
---
identifier: "/us/cfr/t49/s213.323"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 213.323 - Track gage."
title_number: 49
title_name: "Transportation"
section_number: "213.323"
section_name: "Track gage."
chapter_name: "FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
part_number: "213"
part_name: "TRACK SAFETY STANDARDS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 20102-20114 and 20142; 28 U.S.C. 2461 note; and 49 CFR 1.89."
regulatory_source: "63 FR 34029, June 22, 1998, unless otherwise noted."
cfr_part: "213"
---
# 213.323 Track gage.
(a) Gage is measured between the heads of the rails at right-angles to the rails in a plane five-eighths of an inch below the top of the rail head.
(b) Gage shall be within the limits prescribed in the following table:
| Class of track | The gage must be at least— | But not more than— | The change of gage within 31 feet must not be greater than— |
| --- | --- | --- | --- |
| Class 6 track | 4′8″ | 4′9⁄″ | ⁄″ |
| Class 7 track | 4′8″ | 4′9⁄″ | ⁄″ |
| Class 8 track | 4′8″ | 4′9⁄″ | ⁄″ |
| Class 9 track | 4′8⁄″ | 4′9⁄″ | ⁄″ |
[63 FR 34029, June 22, 1998, as amended at 78 FR 16104, Mar. 13, 2013]