Asking it anything regarding people who aren't on board doesn't seem to get very far, so I don't think the first question would do much good. But it might know the second one, so you can ask whether taking a Dark Corridor from an actual world rather than the train or platform would be able to get us home.

[They already knew that on board the train or on the platform, they didn't work. But on a world itself, away from the train's direct influence? Maybe...]