If you've got $400 to blow, you can take this luxury train to Machu Picchu - The Hiram Bingham.  Named after the Yale archaeologist who re-discovered Machu Picchu, on this trip you'll be served two meals (on tablecloth), have cocktails, and be treated to a guided tour of the ruins.  Unfortunately, it travels on the same tracks as the other trains and takes just as long to make the trip.