Which mode should the ATC mode switch be in for territory transition?

The correct mode for the ATC (Automatic Train Control) mode switch during territory transition is MCS, which stands forManual Control System. When transitioning between different sections of track or operating environments, such as moving from an automated control system to a manual operation system, the MCS mode allows engineers to maintain control over the train while ensuring safety and compliance with operational protocols.

In MCS mode, the train engineer can manually manage the train's speed and braking systems, which is critical when navigating areas where automatic systems may not be in effect or where the operating rules differ. This mode supports transition by providing the necessary control flexibility needed in such environments.

In contrast, the other modes may not be suitable for territory transitions, as AUTO typically relies on automated control, which would be unsuitable in areas requiring manual oversight. MANUAL implies complete manual control, but specific protocols for transitioning might be best handled under the structured approach of MCS. CBTC (Communication-Based Train Control), while advanced, may not be applicable in all transition scenarios where direct manual intervention is required to ensure safety and compliance.

Thus, MCS is the appropriate choice for navigating territory transitions in train operations.