49 CFR § 215.111
Defective plain bearing
November 18, 2020
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.