What does an "absolute block" bulletin order indicate for train operations?

An "absolute block" bulletin order is a critical safety protocol in train operations that stipulates that only one train may occupy the track segment between specified points at any given time. This order is designed to ensure the safety of train movements and prevent collisions. By restricting occupancy to a single train, this system provides a clear and secure environment for train passage, allowing operators to manage train schedules and spacing effectively.

In contrast to the other concepts, such as requiring all trains to stop at designated points or allowing for unrestricted movement, the absolute block specifically focuses on occupancy control. It does not imply that trains can operate freely or at any speed they choose; rather, it enforces a structured and safe approach to track usage.