What is the maximum allowable speed in ATC Bypass mode?

The maximum allowable speed in ATC Bypass mode is 40 mph. In ATC Bypass mode, the Automatic Train Control (ATC) system is essentially deactivated, allowing the operator to take manual control of the train. The speed limit is set to 40 mph to ensure safety under the circumstances that the automatic control systems are not in operation. This speed limit helps to mitigate risks that may arise from operator error or other factors when the automated safety features are bypassed. Thus, it's essential for maintaining operational safety while allowing some degree of flexibility for train handling in specific situations.