30 concept cars that never hit the mainstream

Chrysler ME 4-12

Only two models have ever been made of the ME4-12, standing for mid-engine with four turbochargers on a 12-cylinder engine. The two-door coupe had seven speeds and is capable of reaching 399 km/h (248 mph). It’s possible this vehicle was too expensive for the showroom.

Dymaxion

Resembling more of a submarine than a car, the Dymaxion name was a combination of the words dynamic, maximum, and tension. The highly aerodynamic vehicle is believed to have changed the way cars are made, but was never intended as a commercial venture. Only three original models were ever produced.