This engine started life as a bog-standard Mamod SW1 of early 1970s vintage. At some point in it's previous life, it lost it's bodywork and got left somewhere for a long time getting rusty. Eventually, it was advertised on ebay, described as a "steam roller"! The last photo on the left shows it in it's as-bought condition. I converted it into a steam dray outline, roughly based on early examples such as the Bretherton Steam Lorry, also pictured opposite.
The boiler is fired by a meths "vapourising" burner. The internal dimensions of the boiler are 115mm length by 42mm diameter. It is fitted with an overflow level plug, lever type whistle and a standard safety valve. The single acting oscillating cylinder, fitted with a reversing lever, is 8mm dia x 20mm stroke.
The rear end is carried on a channel frame and the rear axle (strictly speaking only the near side wheel) is driven through a two stage reduction belt drive. The overall dimensions of the whole vehicle are approx 430mm length (slightly longer than the SW1), 142mm width x 185mm height.
Since these photos were taken, I have added rubber tyres and brass hub caps.
Photos and a description of the conversion can be seen here
The dray won the Sandman Trophy at Steam Toys Lincs in 2013.