I have a few times. Last night I dreamt I was in the NYC subway (I’ve only been in there a few times in my life, though I’ve seen a lot of pictures and I’m quite interested in it), but it looked more run-down than usual and a bit more, shall I say, European. And I remember seeing a map of all the rail lines in the world, but of course it looked more like a typical subway map, with thick colored lines and bold letters. I remember seeing some tracks, for some reason, in far eastern Siberia.
It’s pretty weird, now that I think about it, that the very next day I read the story posted here about a rail line through a wormhole from Montreal to Samoa. [:0]