What does the signal indicating "proceed" allow the train operator to do?

The indication of "proceed" is specifically meant for the train operator to allow movement while ensuring safety protocols are followed. It signifies that the train can continue its journey, but it is not a permission to speed excessively. Proceeding at normal speed indicates that the train operator should maintain a safe and controlled speed appropriate to the track conditions, signals, and any potential hazards ahead.

This option emphasizes the importance of operating within a safe range while being mindful of variables that may affect the train's performance. Proceeding at normal speed ensures that the operator can react effectively to any unforeseen circumstances, such as signal changes or track conditions. Thus, understanding the nuances of "proceed" highlights the necessity of cautious and responsible train operation.