Under what circumstances can a train be allowed to follow a track car in ABS or DCS territory?

The correct answer is that a train can be allowed to follow a track car in ABS (Automated Block Signals) or DCS (Direct Traffic Control) territory only when authorized by a dispatcher. This is rooted in safety protocols and operational procedures designed to ensure that all movements on the railway are monitored and controlled, especially when there is potential for interactions between a train and track vehicles.

A dispatcher has the authority and expertise to evaluate the current conditions and provide the necessary permissions for a train to proceed behind a track car. This ensures that the train operates safely, with knowledge of the track car's position, status, and any other relevant operational factors. Dispatchers are responsible for coordinating traffic, managing clearances, and maintaining overall safety on the railway, which is why their authorization is critical in these situations.

While it is true that emergencies and bad weather may require specific protocols, the fundamental requirement for trains following track cars is the need for dispatcher authorization, regardless of circumstances. This systematic approach minimizes risks and enhances the safety of both the train and track car operations.