A well-advanced Marshall S-type steam tractor, built to the 3 inch scale Live Steam Models design.
Commercially-built silver soldered copper boiler with original twice working pressure hydraulic test certificate, 100psi working pressure, feed by mechanical pump and injector. Cast iron cylinder with piston valve actuated by Marshall gear, pole reverser, mechanical lubricator.
This is a four shaft, two speed engine with differential running on rubber tyres, it has a winch fitted behind the nearside rear wheel.
The engine runs on air in forward gear, not so keen on reverse. New and, to date, unsteamed. Complete with a set of drawings and Marshall transfer for the boiler cleading.
Length 50 inches