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Above photo from
http://steampunkvehicles.tumblr.com/ 
Walter Christie was involved in the engineering of many other vehicles, steamships, submarines, aircraft and fire engines coincidentally, and this past weekend I and Justacargal were examining the one at the Nethercutt museum just North of Los Angeles in the San Fernando valley:
http://justacargal-s.blogspot.com/2011/03/1913-christie-fire-engine.html 
the 3 some of race cars at the 1908 Minnesota state fair is from
http://steampunkvehicles.tumblr.com/
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At one time, it had a second engine on the rear wheels, in the same transverse powering it's own axle