What action should a train operator take upon observing three lighted yellow lanterns along the track?

When a train operator observes three lighted yellow lanterns along the track, this signals a cautionary situation. The appropriate action in this scenario is to slow down and sound two short whistle blasts. This response is crucial for several reasons.

First, the three yellow lanterns are an indication that there may be a hazard or an upcoming condition on the track requiring the train to proceed with caution. By slowing down, the operator ensures that the train can respond appropriately to any unforeseen circumstances that may arise as they approach the area marked by the lanterns.

Secondly, sounding two short whistle blasts serves as a communication tool, alerting any personnel in the vicinity of the train's presence and its intention to proceed with caution. This is a standard safety measure designed to enhance awareness and prevent accidents.

Furthermore, speeding up or continuing at the current speed in such a situation poses significant risks, as the operator may not have sufficient time to react if a hazard is encountered. Stopping to check the track might also be impractical or unnecessary unless directly instructed by signals or signs, as it could lead to delays and disrupt service.

Overall, responding to the three yellow lanterns with a decrease in speed and an audible alert is the safest and most responsible action for a