What is the indication of a shunt ahead signal?

A shunt ahead signal is indicated by a flashing yellow signal. This signal is used to inform train operators that they should proceed with caution and be prepared to stop. The flashing yellow light serves as a warning that a train must be prepared to encounter another signal or restriction up ahead, reminding them that they are approaching an area where one or more actions may need to be taken. This is crucial for maintaining safety and operational efficiency on the rail network, ensuring that operators are alert to potential changes in the track or signal conditions ahead.

The use of a flashing yellow signal specifically indicates that the train is allowed to move, but it is under conditions requiring heightened awareness. The indication does not suggest that the train can proceed as normal without caution, which distinguishes it clearly from other signals like a static green signal or a continuous red light, which convey different meanings regarding the train's progression.