After stabilizing the train, what should a driver do next if the pantographs cannot be raised?

When the pantographs cannot be raised, the next appropriate action for the driver is to raise the local pantograph using the crank handle. This method provides a manual means to operate the pantograph, ensuring the train can connect to the overhead power supply, which is essential for restoring power to the train system.

Choosing this course of action is vital in situations where automated systems fail, allowing the driver to maintain functionality and safety. This manual intervention is a part of operational protocols for addressing issues quickly and effectively to minimize disruptions.

The other options, such as pushing the emergency stop button, would halt operations entirely and may not resolve the immediate issue of power supply. Activating an auxiliary power supply could be a strategy once pantograph issues are managed, but it relies on having such a system available and would not directly address the failure to raise the pantograph. Switching to manual control mode does not necessarily aid in raising the pantograph and may complicate the driver's tasks without solving the immediate problem. Thus, using the crank handle is the most direct and effective response to the situation at hand.