What does the term "block" refer to in railroad terminology?

In railroad terminology, the term "block" refers to a length of track that is governed by automatic signaling systems. This system is designed to control train movements and ensure safe operations on the railway. Each block is a defined segment of track where signals indicate whether it is clear for a train to proceed or if it is occupied. The use of blocks helps to prevent collisions by ensuring that only one train occupies a block at any given time.

This concept is critical in maintaining safety margins between trains, especially in areas with heavy traffic or complex track arrangements. By utilizing a system of blocks, railroad operators can effectively manage the flow of trains and maintain situational awareness of track conditions.