[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR229.73]

[Page 316]
 
                        TITLE 49--TRANSPORTATION
 
       CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF 
                             TRANSPORTATION
 
PART 229--RAILROAD LOCOMOTIVE SAFETY STANDARDS--Table of Contents
 
                     Subpart C--Safety Requirements
 
Sec. 229.73  Wheel sets.

    (a) The variation in the circumference of wheels on the same axle 
may not exceed \1/4\ inch (two tape sizes) when applied or turned.
    (b) The maximum variation in the diameter between any two wheel sets 
in a three-powered-axle truck may not exceed \3/4\ inch, except that 
when shims are used at the journal box springs to compensate for wheel 
diameter variation, the maximum variation may not exceed 1\1/4\ inch. 
The maximum variation in the diameter between any two wheel sets on 
different trucks on a locomotive that has three-powered-axle trucks may 
not exceed 1\1/4\ inch. The diameter of a wheel set is the average 
diameter of the two wheels on an axle.
    (c) On standard gauge locomotives, the distance between the inside 
gauge of the flanges on non-wide flange wheels may not be less than 53 
inches or more than 53\1/2\ inches. The distance between the inside 
gauge of the flanges on wide flange wheels may not be less than 53 
inches or more than 53\1/4\ inches.
    (d) The distance back to back of flanges of wheels mounted on the 
same axle shall not vary more than \1/4\ inch.