You may be right about the fact someone used a NW-2 pick up truck on the 626 however I looked at 4 of my NW-2 switchers and found they were all non-operating coupelers on the pick up truck. Also the metal steps on the NW-2's were actualy part of the Chassis, just bent up. The steps on the 626 are indeed riveted on to the pick up truck. Mine has no rivet holes so I think its a different truck.The variations I presently know about on the GE 44 ton Switchers are";
. Non-operating coupelers on some units or 1 end
. No headlights(bulb and socket) , just lenses in the shells
. wrong color frames from the common colors . . 2 axle Magnatraction instesad of one.
These variations come from botht "Greenberg's Lionel Trains" and "David Boyles book of Lionel Trains"
Paul