CFR > Title 49 - Transportation > SUBTITLE B—Other Regulations Relating to Transportation > CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (Parts 200–269) > PART 230—STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS > SUBPART C—Steam Locomotives and Tenders (§230.66 to §230.116) > 230.98—Driving, trailing, and engine truck axles.

230.98—Driving, trailing, and engine truck axles.

(a) Condemning defects. Driving, trailing, and engine truck axles with any of the following defects shall be removed from service immediately and repaired (see appendix A of this part for inspection requirements):
(1) Bent axle;
(2) Cut journals that cannot be made to run cool without turning;
(3) Transverse seams in iron or steel axles;
(4) Seams in axles causing journals to run hot;
(5) Axles that are unsafe on account of usage, accident or derailment;
(6) Any axle worn 1/2 inch or more in diameter below the original/new journal diameter, except as provided in paragraph (a)(7) of this section;
(7) Any driving axles other than main driving axles with an original or new diameter greater than 6 inches that are worn 3/4 inch or more in diameter below the original/new diameter.
(b) Journal diameter stamped. For steam locomotives with plain bearings, the original/new journal diameter shall be stamped on one end of the axle no later than January 18, 2005.