.....at : www.douglas-self.com/MUSEUM/LOCOLOCO/fictional/fictional.htm (http://www.douglas-self.com/MUSEUM/LOCOLOCO/fictional/fictional.htm)
.....and nonusual transport engines , at :
www.douglas-self.com/MUSEUM/TRANSPORT/traction/traction.htm (http://www.douglas-self.com/MUSEUM/TRANSPORT/traction/traction.htm)
Imagination disposes apparently of everything...but it is difficult to say what is impossible...with the conversion of heat ( or.....) into mechanical energy.
Al_ex