What defines a block on the railway?

A block on the railway is defined as a length of track between signals. This concept is crucial for maintaining safe distances between trains and ensuring that they do not collide. Each block is monitored by signals that indicate whether the track ahead is clear or occupied. When a train occupies a block, the signals control access to that block, preventing other trains from entering until it is cleared. This system supports safe operations by managing train movements within defined sections of track, allowing dispatchers and engineers to coordinate traffic efficiently. Understanding this principle is essential for effective train dispatching and ensuring operational safety in railway systems.