It makes sense, when Inigo first says it. If the train wasn't accepting communication with the Ministry, then it was likely it wouldn't be very happy about the Ministry being involved now. Was it ignorance? The thought lingers, but then he thinks to the SCAs, the fact they can't communicate with others now.

"--Has anyone tried escaping to the train?" He raises his SCA, looking at it on his wrist. "Push it two, three times, and we end up back, right?"

The evacuation method they share with others who need it.

"Can they jam that too?"