49 CFR §215.127
A railroad may not place or continue in service a car, if—
- (a)The car has a draft gear that is inoperative;
- (b)The car has a broken yoke;
- (c)An end of car cushioning unit is—
- (1)Leaking clearly formed droplets; or
- (2)Inoperative;
- (d)A vertical coupler pin retainer plate—
- (1)Is missing (except by design); or
- (2)Has a missing fastener;
- (e)The car has a draft key, or draft key retainer, that is—
- (1)Inoperative; or
- (2)Missing; or
- (f)The car has a missing or broken follower plate.