They have different definitions of 'fast', especially when it comes to traveling in a not entirely magical contraption some distance off the ground. Rodolphus isn't scared of heights, but they don't exhilarate him either, so to him, the skyrail is fast. For Antonin, though, he says, "No."

And it doesn't, though the glass floor can make the trip interesting all the same. He takes an aisle seat so Antonin can also have a window view, sitting in the same careful way he's been moving since leaving the bar. The car begins moving after another thirty seconds, with all the necessary automated warnings and little chimes to signal it; very shortly, they are approaching the waterfall and the sea beyond with no sign of stopping, though if one strained, it is possible to see where the track curves.

The Fog is not terribly near the tracks. There are parts of the city that are more dangerous. Yet the striking view of it, curled sullen and implacable over the dark waters, has a sense of waiting, maybe even watching — or maybe Rodolphus is still feeling paranoid from his dreams.