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Read about it here: 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/ because Dan at Hemmings wrote a cool long post about the land trains
For other crazy polar exploring vehicles: http://justacarguy.blogspot.com/2009/12/arctic-or-antarctic-explorers.html