What is necessary for transitioning to Release mode after arriving at a station with a stalled train?

Transitioning to Release mode after arriving at a station with a stalled train requires the train to be at a full stop first. This is crucial because operating in Release mode involves disengaging the brakes and allowing the train to move freely. If the train is not fully stopped, engaging Release mode could lead to unintended movement, which poses safety risks for passengers, crew, and other trains in the vicinity.

Being at a full stop ensures that all systems are stable and that the necessary safety protocols are in place for safely transitioning out of a stalled position. Other elements, such as authorization and train control mechanics, are important in their own right but do not supersede the fundamental requirement of ensuring the train is fully stopped before making such a transition.