I have under construction the mightiest cannon ever to leave England's shores. I needed something to pull it across the veldt and the sand. Here is the tug.
It is (surprise, surprise!) a toy locomotive. Well the boiler anyway, which I mounted on tracks from a Disney Atlantis toy. The cab is plastic card. I have added some more tubes to make it 'vintage'.
It is undercoated but will eventually be a resplendent green. This is not the cannon, just its much smaller cousin. The real deal is quite large.