What is defined as a block where no train is permitted to enter while occupied by another train or equipment?

The term that describes a block where no train is permitted to enter while occupied by another train or equipment is known as an Absolute Block. An Absolute Block is a safety measure implemented in railroad operations to ensure that tracks are clear and that no two trains occupy the same block at the same time. This prevents collisions and enhances the safety of train operations.

In practice, when a section of track is designated as an Absolute Block, it is often governed by signal systems that indicate to train crews whether the block is occupied or clear. This system ensures that trains can only proceed into an Absolute Block if it is confirmed to be free of other trains or equipment, thereby maintaining safe distances and preventing accidents.

Understanding this concept is crucial for conductors, as the management of train movements in relation to Absolute Blocks directly impacts the efficiency and safety of train operations on the railway network.