49 CFR 213.53 : Transportation (§ 1.1 To Parts 1581-1699) — (§ 200.1 To Parts 273-299) — Other Regulations Relating To Transportation (Continued) (§ 200.1 To Parts 273-299) — Federal Railroad Administration, Department Of Transportation (§ 200.1 To Parts 273-299) — Track Safety Standards (§ 213.1 To Appendix D To Part 213) — Track Geometry (§ 213.51 To § 213.65) — Gage.

4 Aug 2016

(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 -
Excepted track N/A 4′10 1/4″.
Class 1 track 4′8″ 4′10″.
Class 2 and 3 track 4′8″ 4′9 3/4″.
Class 4 and 5 track 4′8″ 4′9 1/2″.
49 CFR 213.53