49 C.F.R. § 229.73 Wheel sets.
Title 49 - Transportation
(a) The variation in the circumference of wheels on the same axle may not exceed (b) The maximum variation in the diameter between any two wheel sets in a three-powered-axle truck may not exceed (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 (d) The distance back to back of flanges of wheels mounted on the same axle shall not vary more than
Title 49: Transportation
PART 229—RAILROAD LOCOMOTIVE SAFETY STANDARDS
Subpart C—Safety Requirements
Suspension System
§ 229.73 Wheel sets.