A type of geared steam locomotive used extensively in logging. The Shay had three cylinders driving a crankshaft geared to all the axles.
A gear-driven steam locomotive used extensively in logging and mining operations. It has three cylinders mounted vertically on the right side of the boiler driving a crankshaft geared to all axles--sometimes including the tender's axles, when present.
a geared steamer with three vertical pistons on one side of the engine, instead of a pair of horizontal cylinders near the front