What does ATC Bypass mode allow the train engineer to do?

ATC Bypass mode is designed specifically to allow train engineers to continue operating a train even in the event of Automatic Train Control (ATC) failures. This mode is implemented as a safety feature to ensure that operations can proceed in a controlled manner, rather than coming to a halt due to a system malfunction. By enabling this bypass, engineers can maintain the operation of the train while adhering to manual controls and monitoring.

The other options do not accurately reflect the function of Bypass mode. For instance, ignoring all speed limits would be unsafe and counter to train operation regulations, as safety is paramount. Similarly, while Bypass mode enables continued operation, it does not involve automatic slowing down, which is what ATC typically manages under normal conditions. Lastly, maintaining normal operations without authorization would not align with safety protocols; engineers are still required to adhere to set operating procedures, even in Bypass mode. Thus, this option emphasizes the critical role of ATC Bypass in maintaining safety and operational integrity in the event of system failures.