Looking at the first map, thanks for the info Mr Bottles, the line seems to have a shed of sorts. I am wondering if, looking at the pic with both std gauge & nrw gauge, it was war surplus track and if they had any of the Simplex type petrol locos to work it. If they had, as you say, bottom discharge hoppers they must have had a decent grade and therfore must have had motive power. The simplex don't look like a loco more like a steel box on wheels moving along, or like an engine placed upon a chassis with rail wheels shoved underneath. Got me thinking about where to find out more. S4.