For some time now, I have been looking for functional power trucks from AHM O scale C-Liners. (I haven't had much luck, so, if you have any, let me know.) I have been offered other parts and abandoned kit-bash attempts, turnignt hem into 3-rail locos or otherwise modifying them. Some of these forlorn projects I purchase.
One of them was someone's attempt to turn the B + B trucked engine into the passenger B + A-1-A version. A 3-axle truck had been constructed and powered with a HEAVY can motor, and the frame had been weighted. Crude electric wipers had been installed on one side of the front truck for pick-up; the other side had not yet been engineered. The ATSF shell had been painted overall yellow, and Kadee coupler pockets had been installed.
As I look for more functional power trucks, it occurred to me that a very little work and one of my NON-functional power trucks would put the engine in operation. I stripped the dead motor out of a truck but retained the button pick-ups behind the wheels. I soldered wires to the motor leads, and led them to connections to the terminals on the rear power truck. Some gray paint, an Alco PA decal set, and a little black wash in the louvers and fans resulted in this functional 2-rail engine that I will probably use when I visit my buddy who has a decent-sized 2-rail, NYC layout. (It looks high in the rear because I haven't secured the shell in place yet.)