To the best of my Knowledge all the Pair Sets came with 2 Motors. You have a couple of options, either Multi Them up with connecting wires or strip out the Motor Unit from the second one and use as a spare. It runs OK with just one Power Car, but you do also need to Strip out the gears in the gearbox too. Dismantling is a simple Screw Job except for the Roof which just pushed off if you poke your finger through the cab door. It is also still worthwhile to Multi Them for better pick up, though in truth the Flexibility in the chassis makes this the best runner of a 4wheeler that LGB made, even without Track Skates.
JonD