Gears and Pistons on Steam Shovel, The gears and steam pist…

The gears and steam pistons used to maneuver the bucket and arm on the 1916 Type B Erie Shovel made by Ball Engine Company of Erie, Pa. Likely in the top 3 pieces of steam equipment that I enjoy. It was found in Harrisonburg Va. Derelict and used as a sign for a stone quarry. Weight is 41000 lbs, dipper hold 3/4 of a cubic yard, boom is 17 1/2 ft and height is 18 ft, cab is 8

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I understand all the mechanical parts of locomotive valve gear and cylinders on steam locomotives, but i don't quite understand the steam part. But how does steam push and pull the piston?

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