the LeTourneau electric arctic land trains has a great write up recently on http://blog.hemmings.com/index.php/2009/11/19/54-wheel-drive-the-letourneau-electric-arctic-land-trains-that-put-australian-road-trains-to-shame/
Above, the Kee Bird, which was the subject of an awesome recovery effort when private funding got it up and running, and moving, but old electrical wiring shorted, and the whole thing burned to cinders on film while a documentary was being filmed, it is so worth seeing! 
