What governs if there is a conflict between the cab signal indicator and a fixed signal?

In situations where there is a conflict between the cab signal indicator and a fixed signal, the governing principle is to follow the more restrictive indication. This means that if one of the signals conveys a more restrictive aspect, such as a lower speed or a stop, that indication takes precedence because it is designed to ensure safety and reduce the likelihood of incidents or accidents.

The rationale behind prioritizing the more restrictive indication is rooted in the importance of safety in train operations. The need to err on the side of caution is paramount in railway signaling, as it helps to mitigate risks associated with train movements and ensures adherence to the safest operational practices. By following the most restrictive signal, crew members can make informed decisions that prioritize their safety and the safety of passengers.

In this context, fixed signals, such as signals seen from the trackside, may provide critical information that needs to be adhered to, but they must be interpreted within the overall framework of signaling safety, which is why the more restrictive rule applies. This principle aligns with standard practices across many railway systems, reinforcing the importance of maintaining a high safety standard in train operations.