What is the function of block limit signals?

Block limit signals are primarily used to govern the usage of a specific length of track, ensuring safe train operations within a designated segment. These signals define the boundaries of a block, which is the section of track between two signals. By clearly indicating the beginning and end of this block, they help prevent collisions and manage the flow of train traffic.

In the context of train operations, the correct understanding of block limit signals is crucial, as they provide essential information to conductors and engineers about when it is safe to enter or occupy a particular track segment. Such signals enhance operational safety by enforcing strict controls over train movements within these designated areas.