49 CFR §215.109
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.