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Kind of a neat demonstration of the driving force behind a locomotive.
http://www.keveney.com/Locomotive.html
And for other types of engines look at the main url here.
http://www.keveney.com/Engines.html
All illustrations are animated and help some of us slower types better understand the physics involved.
Youth crisis hot-line 866-488-7386, 24 hr (U.S.A.)
There are people who want to help you cope with being you.
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