Train song suggestions

I'm taking Amtrak up to Seattle for Sherlock Seattle, which means that I need a playlist of songs about trains.  Anyone have good suggestions for songs about trains/railroads?

Already on the list (several of these are covers, but I'm listing the version I have rather than the original artist):
-Freshlyground, "Train Love"
-Willie Nelson, "City of New Orleans"
-Johnny Cash, "Folsom Prison Blues"
-Shawn Mullins, "September in Seattle"
-Sarah McLachlan, "Train Wreck"  (still debating on the inclusion of this one, as its title seems rather unlucky)
-Johnny Cash, "I've Been Working on the Railroad"
-Indigo Girls, "Midnight Train to Georgia"

Johnny Cash has several more songs about trains, like "Orange Blossom Special," but in order to keep some diversity in the playlist I'm not putting any more by him on at the moment, though I'd be happy to have other artists' covers.