Mamod
Mamod a British toy manufacturer specialising in manufacturing live steam models. The company founded in 1937 in Birmingham in the UK by Geoffrey Malins.
Most Mamod models use simple but effective oscillating cylinders, usually single-acting. Some of these engines have regulators either in the steam feed or exhaust but many others run unregulated (in the simpler models) or have a simple reversing mechanism to alter the cut-off, thus controlling the power/speed and direction of the engine.