What should a train operator do after accepting a call-on at a home signal?

When a train operator accepts a call-on at a home signal, the appropriate next step is to proceed at restricted speed with extreme caution. This is crucial for several reasons.

First, a call-on signal indicates that it is safe to proceed, but there may be a condition ahead that requires the train to be prepared to stop for any unexpected situations, such as an obstruction on the track or another train that has not cleared the area. By traveling at restricted speed, the operator ensures they have the ability to stop quickly if necessary, helping to maintain safety.

Moreover, restricted speed often entails following additional protocols, such as watching for signals and clearances ahead, which further emphasizes the importance of vigilance during the operation. This careful approach reflects standard operational practices designed to balance the need to keep the train moving while prioritizing safety in potentially hazardous conditions.

The other options imply either excessive speed or an unnecessary halt, which would not align with the proper procedures following a call-on signal.