Under what condition can a train follow a track car into an automatic block?

The correct answer relates to operational safety protocols that ensure trains do not enter occupied tracks without proper authorization. In this context, the use of Form-L authorization is critical. Form-L acts as a written or electronic permission that grants specific instructions for movements on the track, especially in situations where the track may be occupied by work equipment, such as a track car.

Form-L ensures that all parties are aware of potential safety hazards and that the necessary precautions have been taken to allow for the safe passage of a train after a track car. It provides not just permission but also necessary details such as the location, duration of the occupation, and any other pertinent information that facilitates safe operations on that block of track.

Other options may involve signaling or the presence of personnel, but they do not constitute formal authorization required for safe movement in such scenarios. This makes Form-L a vital tool in managing train operations around work equipment, aligning with safety regulations and operational protocols.