What happens when a train operates under MAS in the absence of specific instructions?

When a train operates under Maximum Authorized Speed (MAS) in the absence of specific instructions, it is allowed to continue at the maximum speed that has been authorized for that segment of the track. This means that as long as the train is operating under MAS and there are no directives given that would require a reduction in speed, the train is permitted to maintain that maximum speed safely.

In practical terms, MAS represents the highest speed a train can go without needing to reduce its speed unless instructed to do so. This principle is crucial for ensuring efficiency in train operations while still adhering to safety standards, as it allows trains to operate at optimal speeds within designated limits.

Other responses imply restrictions or conditions that do not apply when operating under MAS without specific instructions.