If a train overruns a block signal requiring it to stop, can the train stop and shove back to clear the signal?

When a train overruns a block signal, it indicates a violation of signal indications that are in place for safety. The primary concern is ensuring the safety of both the train and any potential rail traffic. Once a train has passed a stop signal, it cannot simply reverse back to clear the signal. This is due to several safety protocols that require all trains to adhere strictly to signal indications to prevent potential collisions and ensure safe operations on the network.

Allowing a train to shove back to clear a signal poses significant risks. It could confuse subsequent traffic, create situations where other trains are not expecting a train's movements, and potentially lead to dangerous situations on the railway. As such, protocols are set to handle these scenarios without reversing past signals. Instead, proper procedures must be followed to rectify the situation while maintaining safety for all.

The other options might imply that there could be circumstances or permissions that allow such action, which undermines the importance of strict adherence to signals and established operational guidelines.