What must be adjusted upon switching to MCS mode?

When switching to MCS (Multiple Control System) mode, it is crucial to adjust the train's operational speed profile. This mode requires specific speed settings and profiles that are tailored for the conditions and operational criteria expected during MCS operation.

In MCS mode, trains may experience different track conditions, signaling, or operational protocols that necessitate careful management of speed to ensure safety and compliance with system requirements. Adjusting the speed profile helps accommodate these variables, allowing for smoother operation and adherence to guidelines that enhance safety and efficiency.

The other choices do not directly relate to the primary adjustments necessary when switching modes. While communication with Control might need to be established or checked, it is not the primary operational change like speed adjustment. Changing the destination is typically a logistical decision rather than a direct necessity for mode-switching. Lastly, the power supply to the train usually remains consistent regardless of the operational mode unless specific problems arise.