What is an "interlocking" in railway terms?

The term "interlocking" in railway operations refers to a set of signals and track switches that are configured to work together to control train movements at junctions and crossings. This system is crucial for ensuring safe and efficient movement of trains through complex track layouts where multiple routes intersect.

By using interlocking, railway operators can prevent conflicting movements. For example, if one train is given a signal to proceed while another is directed onto a track that intersects with the first train's path, the interlocking system will ensure that such a situation cannot happen. This minimizes the risk of collisions and enhances overall safety on the railway network.

In comparison to the other options, overlapping train schedules, procedures for loading trains, and safety protocols for inspections do not directly relate to the mechanics of how trains are routed and controlled through junctions, which is the primary function of an interlocking system.