A railroad may not place or continue in service a car, if—

1. (a) The car has a draft gear that is inoperative;
2. (b) The car has a broken yoke;

3. (c) An end of car cushioning unit is—

   1. (1) Leaking clearly formed droplets; or
   2. (2) Inoperative;

4. (d) A vertical coupler pin retainer plate—

   1. (1) Is missing (except by design); or
   2. (2) Has a missing fastener;

5. (e) The car has a draft key, or draft key retainer, that is—

   1. (1) Inoperative; or
   2. (2) Missing; or
6. (f) The car has a missing or broken follower plate.