The Brunei 'Train'

I took this photo from the bus on the way back to Bandar after the wedding on Sunday. By the time I switch on my camera, this 'train' had already crossed the 4 tee junction heading into Tutong camp.What is it? I am not so sure. I think it's a train (on wheels) and used by the Army to entertain kids. It is the first time I have seen it. Probably there must be people out there with better