Title 49: Transportation
PART 229—RAILROAD LOCOMOTIVE SAFETY STANDARDS
Subpart C—Safety Requirements
Suspension System
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§ 229.73 Wheel sets.
(a) The variation in the circumference of wheels on the same axle may not exceed1/4inch (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 exceed3/4inch, except that when shims are used at the journal box springs to compensate for wheel diameter variation, the maximum variation may not exceed 11/4inch. 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 11/4inch. 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 531/2inches. The distance between the inside gauge of the flanges on wide flange wheels may not be less than 53 inches or more than 531/4inches.
(d) The distance back to back of flanges of wheels mounted on the same axle shall not vary more than1/4inch.
