This is a picture of a free-lanced HOn30 railbus. A Bachman N-scale trolley provides the motive power. In this case one end (truck) of the chassis is cut off, leaving a rather elongated "spud"-type drive. This is shoehorned into an HO scale Jordan Highway Miniatures 1934 Ford bus. The front truck is a low-profile N-gauge archbar. There is room on top of the motor to put seatbacks and the upper torsos of plastic figurines; you can make out the seatbacks in the picture. The disk-shaped copper object is a US penny (7.5 mm diameter).