If the Emergency brake MCB trips, what happens?

When the Emergency brake MCB (Motor Circuit Breaker) trips, the train is effectively disabled if this occurs in the active cab. This mechanism is designed to ensure the safety of the train and its passengers. The Emergency brake system is critical for preventing accidents and maintaining control under emergency conditions.

By disabling the train, the system prevents further operation that could lead to dangerous situations, ensuring that all safety protocols are followed. This design is a precaution that prioritizes the well-being of everyone on board.

In contrast, the other choices present scenarios that do not align with safety protocols. The train cannot be operated normally if the Emergency brake has tripped because that would compromise safety. Similarly, while the train may be slowed down by the emergency brake, the most crucial point is that the train cannot continue to operate in a manner that could endanger those on board. Also, driving from another cab would not be possible since the system is designed to halt operations to avoid the risk inherent in a potentially compromised situation.