What distance must a train maintain from a stopped train?

The requirement for a train to maintain a distance of 500 feet from a stopped train is based on safety protocols designed to ensure a safe operating environment for both trains and passengers. This distance acts as a buffer to prevent collisions in the event that the stopped train begins moving unexpectedly or if other unforeseen circumstances arise.

Maintaining a 500-foot gap allows for adequate stopping distance, assuming the train in motion must decelerate quickly or make an emergency stop. The specified distance helps to reduce the risk of accidents and ensures that conductors and crew members have a sufficient safety margin to react appropriately under various conditions. Variability in speed, track conditions, and train weights further emphasizes the need for such a significant distance.

The other options suggest shorter distances, which do not provide the same level of safety assurance in the event of sudden movements or emergencies. These shorter distances could lead to increased risk of accidents if a train were to start moving unexpectedly or if another train were to approach the stopped train, highlighting the importance of adhering to the established 500-foot requirement.