This is one of my own creations, inspired by a Mann steam roller. The interesting design feature of the Mann roller, which attracted it to me, is the fact that the main roll is at the rear, driven by a chain, and the front steering fork carries a pair of smaller rolls.There is a blog of the build project here. Like most of my creations, the model is made up from a mixture of parts made by Mamod, Wilesco and Meccano, with a few scratch built parts. The boiler, firebox and engine came from a Mamod SR1A. The smoke box came from a Mamod TE1A. The chassis and canopy came from a Mamod SW1. The front rolls are Mamod SR1A front rolls, cut down in width and mounted on a TE1A steering fork. The rear rolls are from a Wilesco Old Smokey roller. The drive pulleys, sprockets etc are a mixture of Mamod and Meccano. The side pannels, dummy water tank and tipping platform are scratch built, except the platform hinge, which is made from Meccano parts. The burner is a Bix butane ceramic burner, designed for the TE1A. The brass chimney crown is a commercial product, also designed for the TE1A. The butane burner is permanently attached to the scuttle, which is bolted to the back of the firebox. The boiler is 4 7/8" long by 1 3/4" diameter, embedded in the firebox at the rear end and bolted to the smokebox at the front end. The front of the smoke box still shows it's provenance, being marked "Mamod TE1A". A safety valve is mounted near the front of the boiler, an all brass whistle over the firebox and a water level sight "glass" at the rear end.
Steam is fed directly to the engine, which is a single cylinder, single acting, reversing type. It's dimensions are 5/16" diameter x 3/4" stroke. Drive is taken from the flywheel to an intermediate double pulley (from an SW1) via a spring band. The smaller pulley drives a large Meccano pulley, which is fixed to a short shaft also carrying a small Meccano chain sprocket. This drives a larger sprocket on the rear axle.There is a small tipping platform mounted in the rear of the chassis, over the rear roll. This is similar to the original Mann roller. There is a dummy water tank covering the butane tank, removable for access. The canopy is hinged to give access to the top of the boiler.