What happens to a train with the ATC mode switch in the Release position at a territory boundary?

When the ATC (Automatic Train Control) mode switch is set to the Release position at a territory boundary, it indicates that the train is allowed to proceed without any restrictions. This is because the Release position generally signifies that the train is no longer subject to strict oversight or control mechanisms associated with the previous territory.

In this scenario, the system typically operates under the understanding that the train has authorizations or permissions to continue its journey uninterrupted, assuming that it is within a governed speed limit and other operational safety protocols are being observed. This creates a seamless transition between different territory controls, facilitating efficient movement across boundaries without causing unnecessary delays.

Other options suggest halting, significantly reducing speed, or changing control to a system, which does not apply in this case. The train is designed to maintain safety through the ATC system, but the Release position specifically allows normal operation as it crosses into a territory where it is authorized to proceed.