What defines an interlocking in railroad operations?

An interlocking is defined as a sequence of interconnected signal appliances that work together to manage train movements and ensure safety. This interconnected system of signals and switches is designed to prevent conflicting train movements, allowing multiple trains to operate in a specified area without risk of collision. The signals inform engineers and conductors about the status of the tracks and switches, ensuring that they have the correct information to proceed safely.

In a reliable interlocking system, the design typically includes mechanisms that control the signals based on the position of the track switches, thereby creating an automated method of safeguarding operations. This enhances operational efficiency and safety in busy rail areas where multiple lines intersect or converge.

The strength of this definition lies in the comprehensive nature of an interlocking. It encompasses not just individual signaling devices but the entire coordinated system that provides a framework for safe railway operations.