49 CFR 230.100: Defects in tender truck axles and journals.

(a) Tender truck axle condemning defects. Tender truck axles with any of the following defects shall be removed from service immediately and repaired:

(1) Axles that are bent;

(2) Collars that are broken, cracked, or worn to 1/4 inch or less in thickness;

(3) Truck axles that are unsafe on account of usage, accident, or derailment;

(4) A fillet in the back shoulder that is worn out; or

(5) A gouge between the wheel seats that is more than 1/8 of an inch in depth.

(b) Tender truck journal condemning defects. Tender truck journals with any of the following defects shall be removed from service immediately and repaired :

(1) Cut journals that cannot be made to run cool without turning;

(2) Seams in axles causing journals to run hot;

(3) Overheating, as evidenced by pronounced blue black discoloration;

(4) Transverse seams in journals of iron or steel axles; or

(5) Journal surfaces having any of the following:

(i) A circumferential score;

(ii) Corrugation;

(iii) Pitting;

(iv) Rust;

(v) Etching.