(Yes, there are posters for sale, but Flickr won't let me link to them.)
Presenting the latest in my series of transit-styled diagrams, the entire Amtrak passenger rail system in the style of a subway map. Surprisingly, I haven't seen another take on this anywhere else on the internet, but I guess it is a fairly monumental undertaking (Good thing I'm the patient type!). Every last station is shown, the result of a lot of research on both Amtrak's official site and Wikipedia. This version has all station names and route information listed.
EDIT: November 26, 2012 - I've updated this map with the latest route and station information. Only minor changes: extended the Downeaster to Brunswick, Maine, added a second Santa Clara station (University) to the Capital Corridor route, a couple of stations dropped off the Keystone service, fixed a few timetabling errors and typos.
EDIT: December 11, 2012: Another update to include the new Northeast Regional service to Norfolk, Virginia.
EDIT: October 9, 2013: Update to the Pacific Surfliner route: deleted the Orange and Laguna Niguel stations; added Carlsbad Village, Carlsbad Poinsettia, Encinitas and Sorrento Valley stations. Removed Richmond from the Coast Starlight. Added Ardmore back to the Pennsylvanian route - Amtrak's site lists it as serving that line (it seems that it stops there only on Sundays).
EDIT: January 7, 2015: Updated the Vermonter route: added Greenfield and Northampton stations; removed Amherst station.