Which of the following describes Interlocking Signals?

Interlocking signals are fixed signals that govern the movement of trains within interlocking limits, ensuring safe and efficient operation of train traffic. They are part of a signaling system designed to prevent conflicting movements through an arrangement of tracks, switches, and signals. The primary function of interlocking signals is to maintain safety by indicating whether a route is clear, allowing trains to proceed or stopping them as necessary.

The characteristics that define interlocking signals include their role in protecting complex track areas where multiple tracks converge, and switches need to be aligned properly to prevent accidents. This is particularly crucial at junctions or crossings.

The other options refer to specific types of signals or situations but do not accurately capture the essence of interlocking signals. For example, controlling track switches only is a function of a specific type of signal but does not encompass the broader control of train movements that interlocking signals provide. Similarly, emergency stop signals and temporary signals for maintenance are not the same as interlocking signals, which serve a permanent and critical function in maintaining operational safety in interlocking areas.