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Wheeled Steam Engines are divided into two groups, self-propelled steam powered traction machines and steam powered machines with wheels, capable of being towed but not self-propelled.
The self- propelled group includes railway steam locomotives and steam road vehicles such as traction engines and road rollers, with traction engines often doubling up as stationary belt drivers for powering farm machinery. The non self- propelled wheeled engines were developed as a readily moved power supply
and were a common agricultural, civil engineering, drilling and mining machine. R_31978