hi, await more info, but in the meantime, does he have track/ controller. I run sizeable 3 rail layout, and normal prob with stored locos, is simply needing careful oil/ service. If you can see the oil, you have used too much. 9 volt battery , with 2 wires, will prove motor turns. Dirty track, / unused, will also be a cause. I have 20 plus locos, and there is little to go wrong. These were built, in those days to resist problems, and usually, just getting the com to spin, will get them moving. john.