Cylinder (locomotive)
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The cylinder is the power-producing element of the steam engine powering a steam locomotive. The cylinder is made pressure-tight with end covers and a piston; a valve distributes the steam to the ends
The 'motion' on the left-hand side of 60163 Tornado. The black casting to the left houses the cylinder, in which slides the piston; the piston rod is immediately above the wheel.
French 2-2-2 locomotive with nearly horizontal cylinders, 1844
A NYC switching locomotive with outside valves driven by inside valve gear (Howden, Boys' Book of Locomotives, 1907)
The cylinders on a Shay locomotive.
Planet (locomotive)
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Planet was an early steam locomotive built in 1830 by Robert Stephenson and Company for the Liverpool and Manchester Railway.
Cylinder (locomotive)
…The front-mounted cylinders could be placed either inside (between the frames) or outside. Examples of each are: Inside cylinders, on the Planet locomotive Outside cylinders, on Stephenson's Rocket…
Replica of Planet operating at the Science and Industry Museum
A contemporary engraving of a locomotive "similar to the Planet", though with some differences in detail