49 CFR 299.327 - Rail end mismatch.

Regulations last checked for updates: Feb 07, 2026

Title 49 - Transportation last revised: Feb 03, 2026

§ 299.327 - Rail end mismatch.

Any mismatch of rails at joints may not be more than that prescribed by the following table:

Track class	Any mismatch of rails at joints may not be more than the following:
Track class	On the tread of the rail ends (mm)	On the gauge side of the rail ends (mm)
H0	6	5
H1-H2	4	4
H3-H7	2	2

authority: 49 U.S.C. 20103,20107,20133,20141,20302,20306,20701,21301,21304; 28 U.S.C. 2461,note; and 49 CFR 1.89

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

cite as: 49 CFR 299.327