CFR /  Title 49  /  Part 215  /  Sec. 215.111 Defective plain bearing.

A railroad may not place or continue in service a car, if the car has a plain bearing--

(a) That is missing, cracked, or broken;

(b) On which the bearing liner--

(1) Is loose; or

(2) Has a broken out piece; or

(c) That shows signs of having been overheated, as evidenced by--

(1) Melted babbitt;

(2) Smoke from hot oil; or

(3) Journal surface damage.