How can a train transition from Release mode into MCS mode?

The process of transitioning a train from Release mode to MCS (Manual Control Station) mode requires the ability to operate the train under specific conditions, and one of those conditions allows for such a transition to occur while the train is in motion. This flexibility ensures that operators can make necessary adjustments to the train's operational status without needing to halt the train, maximizing efficiency and safety in train operations.

In MCS mode, the train is under manual control, which is often required to navigate complex situations or manage unexpected events. The ability to transition into this mode while on the move highlights the system's design, allowing for continuous operation without delays, which is crucial for maintaining schedules and adhering to safety protocols.

The other options, while they may present logical scenarios, do not align with the operational flexibility required in train management systems. For instance, transitioning only while stopped could lead to unnecessary delays and disrupt service patterns. Therefore, being able to make this transition while the train is in motion is essential for effective train operation.