Yep I had one as well. Hopefully your Dad should have put Mentholated Spirit in the little tray under the boiler. Petrol would have exploded a bit....
I put the drive belt thing on my Sisters head, the coils closed up trapping her hair, the only way to remove it was to cut her hair out.

My friend John Littlewood had the Traction Engine one, we were left unattended (both 7 years old) and re-enacted the tug of war scene from the film "The Titfield Thunderbolt". Unfortunately we connected them by tieing the fireboxes together, then setting them off....
Unsurprisingly both machine's set off in opposite directions, resulting in the fireboxes being pulled out of both machines and tipping their flaming contents onto the lino kitchen floor. This was followed by shouting, lots and lots of shouting when his Mum came back in.
P.S. I've just checked with my Wife, seems my steam engine is in the garage somewhere, I'll look later.