If a fixed signal is absent, how must a train proceed?

In situations where a fixed signal is absent, a train must proceed as if the most restrictive indication applies. This means that in the absence of a clear signal providing guidance on the speed or status of the track ahead, the train must be cautious and operate under the assumption that there may be conditions requiring reduced speed or stopping.

This approach prioritizes safety, ensuring that trains do not inadvertently encounter hazards or conflicts with other trains on the network. It is a standard precaution taken in rail operations, as many potential dangers or operational issues may not be immediately apparent without a signal to provide information on track conditions or traffic.

The other options would not adhere to the necessary safety standards. Proceeding at maximum speed disregards the possibility of unexpected obstacles or unsafe track conditions. Operating only if authorized by the Dispatcher might be appropriate in certain circumstances, but does not specifically address the situation where a fixed signal is absent. Waiting for additional instructions from crew members could lead to delays and does not ensure immediate responsiveness to operating in a potentially hazardous situation. Thus, recognizing the need to adhere to the most restrictive indication when a fixed signal is not present is the correct protocol.