[So is Krolia, but as one of the leaders of a secret network, her tendencies aren't simply tempered, but she has spent years helping her subordinates do the same. That said, it certainly is a small universe, after all. Speaking of, she's suddenly glad that certain Disney song we don't talk about "Clear Day" in this family isn't playing in the background. Imagine being forced to listen to that for four hours.]

In which case I would suggest waiting until it is out of sight range of the servants, possibly far enough to not be suspicious but ample time to gain distance before they realize we've vanished.

[Easily resealed, too -- unless either of them feel like being horrible and letting those who come in after them see the light in the middle of the tunnel and be unable to reach.] Otherwise, I would aim lower. Preferably out of plain sight or at a curve in the rails.