If there are additional track cars operating under the same Form D authority, what must be done for identification?

The correct answer emphasizes that when there are multiple track cars operating under the same Form D authority, it is essential to specify each additional piece of equipment involved in the operation. This ensures clarity and identification for safety and operational purposes. By listing additional pieces, dispatchers and crew can clearly understand all the track cars involved, which is critical for maintaining coordination and safety on the tracks.

In rail operations, accurate identification of all equipment involved is vital to prevent misunderstandings or accidents. Listing additional track cars allows all personnel to be aware of the resources and activities in play, thus maintaining an organized and safe operating environment. This comprehensive identification protocol also aligns with procedural standards aimed at ensuring effective communication and safety within the rail system.

The other choices do not fully accommodate the need for precise identification or imply that all cars may be treated less rigorously, which could lead to safety risks or confusion among the crew and during dispatch operations.