What does "interlocking" signify in railroad terminology?

Interlocking in railroad terminology refers to a safety system that coordinates the movements of trains and the operation of signals at junctions or where tracks cross. This system is crucial for preventing conflicts between trains, ensuring that only one train can occupy a segment of track at a time, and that signals are appropriately set to control train movements safely.

The interlocking system uses a combination of signals, switches, and locks to control the routing of trains through complex track layouts. It guarantees that switches are aligned in a manner that prevents trains from entering overlapping track segments, significantly reducing the risk of accidents at crossings.

By focusing on safety, interlocking systems play a vital role in maintaining efficient and safe train operations, particularly in areas with multiple track intersections. The other options do not encompass this critical safety aspect; they refer to different components and procedures within railroad operations that do not specifically relate to the interlocking system’s core functions.