What is the function of an interlocking appliance?

The function of an interlocking appliance is primarily to allow or prevent movements over designated routes. An interlocking system is designed to manage traffic control in a safe and efficient manner, preventing conflicting train movements that could lead to accidents. It ensures that signals and switches are locked in place, allowing only specific routes to be set for train passage. This control mechanism is crucial in railway operations, particularly at junctions and busy intersections, where multiple tracks converge.

While restricting access to train tracks, signaling trains, and communicating with road workers are important functions in railway operations, they are not the primary focus of interlocking appliances. The interlocking system primarily ensures safe train movements by managing and controlling the routes used by trains.