fixedsignal

Fixedsignal refers to a type of railway signal that displays a permanent aspect, meaning it does not change based on track occupancy or the movement of other trains. These signals are typically used to indicate permanent restrictions or conditions. For instance, a fixed signal might be set to display a red aspect permanently, indicating that the line is permanently closed or that movement beyond that point is prohibited. Alternatively, a fixed signal could display a yellow aspect to warn of a permanent speed restriction ahead.

The primary purpose of a fixed signal is to provide a clear and unambiguous indication of a fixed condition that drivers must always adhere to. Unlike route signals or block signals, which are dynamic and change their aspect to control train movements, fixed signals remain constant. Their installation is usually for safety purposes, ensuring that all train movements are aware of and comply with permanent operational constraints or hazards. Maintenance and testing procedures for fixed signals are designed to ensure their aspect remains correct and visible at all times. The interpretation and adherence to fixed signal aspects are crucial for safe railway operations.