What is the required action for a train when taking siding?

When a train is taking a siding, it is crucial to ensure that it stops at least 400 feet from the nearest signal. This distance is significant because it allows for safe operation and ensures that the train does not interfere with the signal system or any adjacent track operations. Stopping at this distance helps maintain the safety protocols established to avoid collisions and ensures that the train can be properly positioned on the siding without risking an obstruction to other trains or the signal system.

This standard is a part of operational safety measures that trains must follow. It reflects the necessity of giving adequate space for visibility and control, enabling both the crew and signal operators to work efficiently.