This object identifies, by mesh-ID, the specific mobile radio device physically located in the tail car of a train. An admin uses this alongside ciscoUrwbTrainHead to confirm both ends of the train have their onboard radios correctly identified, which is important for train-length mesh handoff logic. If a train reverses direction and ciscoUrwbTrainHead and ciscoUrwbTrainTail values don't update accordingly, the admin would investigate whether the system correctly re-detected the train's new orientation.