49 CFR § 215.109 - Defective plain bearing box: Journal lubrication system.
A railroad may not place or continue in service a car, if the car has a plain bearing box with a lubricating pad that -
(a) Has a tear extending half the length or width of the pad, or more;
(b) Shows evidence of having been scorched, burned, or glazed;
(c) Contains decaying or deteriorated fabric that impairs proper lubrication of the pad;
(d) Has -
(1) An exposed center core (except by design); or
(2) Metal parts contacting the journal; or
(e) Is -
(1) Missing; or
(2) Not in contact with the journal.