Wagon Shunter in O Gauge.

I have recently weathered a railway vehicle for my friend Graham M. It looks like a flat wagon with an added cab and internal combustion engine. It was purchased off Ebay for curiosity value. It is unpowered but Graham intends to motorise it. Its origins seem to be European, but we are lead to believe that a few were imported to the UK. I believe they cost about £30-35, and it is solidly built apart from the wheels which are awful and would benefit from replacement, motorising or not. I could see a motorised loco (wagon) on a nice little O Gauge shunting plank. Another mate has already invested in one.