When a Form D is issued to TC to follow a train, what is the maximum distance allowed for the Form D line 2 limits?

The correct response indicates that when a Form D is issued to a train crew (TC) to follow another train, the maximum distance for the Form D line 2 limits is restricted to not exceeding the next interlocking. This restriction is in place to ensure safe train operations, as interlockings are critical points in the railroad system where tracks converge or diverge, and they are designed to manage the movements of trains safely.

By limiting the distance to the next interlocking, it minimizes the risk of collisions between trains and ensures that the following train can adequately respond to signals and switch positions as required by the operating rules. This operational practice is crucial for maintaining safe and efficient train movements, especially when one train is required to follow another closely.

Other options suggest larger distances that are not compliant with the regulations in practice. For example, extending limits to the next station or beyond the next interlocking could lead to complex operational scenarios that might compromise safety. The emphasis on the next interlocking aligns with standard practices in the railroad industry to maintain strict control over train movements and operations.