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The side rods are the traction motors of a steam engine, if you will. They relay the steam power from the boiler through the valves to the wheels. The valve motions are various. The oldest, Stephenson link, was cranked to the axles. The other types, Walshaert; Baker; Southern, and some minority types like Pilliod, were externally mounted. Examples of all of them are found at various museums. The museum in the old WMRY station at New Oxford, Pa, had hand-cranked working Walshaert v.g.; as you cranked the gear while in forward, you could latch up the gear through the johnson bar and the wheels went faster [even though you cranked at the same speed]. After reversing the gear, even though you still crank the same way, the wheels ran in reverse. Really a neat way to see how the Walshaert gear worked.
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