If a train runs over 1 RTS, what is the immediate action required?

The immediate action required when a train runs over a railway track signal—commonly referred to as an RTS (Remote Train Stop)—is to sound one long whistle. This action serves as an alert to other rail operators and individuals in the vicinity that an incident has occurred, allowing for appropriate measures to be taken in response to the situation.

The long whistle indicates a serious scenario that requires attention and conveys information about the status of the train and the need for caution. Sounding one long whistle is part of the safety protocols established to maintain communication and ensure safety along the rail network.

In contrast, the other options may not adequately address the urgency and nature of the incident. Sounding two short whistles, for instance, typically indicates different signaling contexts that may not convey the same level of alert as a long whistle. Increasing speed contradicts the necessary caution that needs to be exercised in response to such incidents, and stopping the train immediately, while certainly a potential response, might be part of a broader safety procedure and not the first immediate action signaled by the incident.