What is the minimum operational speed a train should maintain before service brakes engage in Release mode?

The minimum operational speed a train should maintain before the service brakes engage in Release mode is 12 mph. This threshold is important because it ensures that the braking system functions effectively. If a train operates below this speed, there may not be sufficient mechanical efficiency or momentum for the brakes to engage correctly, potentially compromising safety and control.

In contrast, speeds lower than this minimum may lead to less predictable stopping distances and increases the risk of losing control, particularly in emergency situations. Adhering to a minimum operational speed of 12 mph helps maintain the integrity of the braking system and overall operational safety. This specification represents a standard based on extensive testing and operational experience in train handling, ensuring that engineers have a reliable guideline to follow for safe operation.