Designed & built by Steve "Doc" Hopkins, owner of Doc's Harley-Davidson of Shawano County, Wi, the Timeline Motorcycle is a rolling history of Harley-Davidson. The motorcycle features the 7 air-cooled Harley-Davidson Big-Twin engines from 1909 to present. Seats 10 people. Official Doc's H-D video of the 2009 Timeline Motorcycle voyage to the Sturgis rally in South Dakota. All seven engines do run & contribute power to the motorcycle. Over 24 1/2 feet long! 538 total cubic inches, 2 front wheels, 2 rear wheels. Uses over 40 feet of chain.