What action should a train operator take upon seeing a single yellow lantern suspended on the right-hand side of the track?

The presence of a single yellow lantern suspended on the right-hand side of the track signals a warning condition. This indicates that the train operator should take action to ensure safety, specifically by bringing the train under control. The yellow lantern serves as a cautionary signal, alerting the operator to the possibility of working crews or other obstructions on or near the tracks.

By blowing the warning horn, the operator communicates awareness of potential hazards to the personnel working on the track, ensuring their safety and maintaining proper operational protocol. This action is essential to promote a safe environment as it alerts any nearby crew members of the train's approach, allowing them to take necessary precautions.

This precautionary measure aligns with standard operating procedures in rail transportation where safety is paramount. Cautious operation in response to warning signals demonstrates an understanding of the need for vigilance and proactive safety measures in an actively used rail corridor.