What does a yellow signal indicate to a train operator?

A yellow signal is a crucial indicator for train operators, signaling them to proceed with caution while being prepared to stop if necessary. This cautionary signal typically signifies that the train is approaching a more restrictive signal ahead or that conditions may require a slower pace. The operator must be alert and ready to respond accordingly, which could include reducing speed or stopping, depending on subsequent signals or track conditions.

This understanding is vital as it ensures safety and efficiency in train operations. The operator's readiness to react to changing circumstances occurs within a framework of communication between various signals along the track. Recognizing what a yellow signal means is essential for operational safety and helps prevent accidents that could arise from misinterpretation of the signal's intent.