Soviet opposed-piston 2-10-4
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The Soviet-built opposed piston 2-10-4 locomotive
Built in 1949, this was one of a number of Soviet locomotive designs that was very successful[citation needed]. The cylinders were placed above the center driving axle. Unlike nearly all steam locomotives, the pistons had rods on both ends which transferred power to the wheels. The idea was to balance the driving forces on the wheels, allowing the counterweights on the wheels to be smaller and reducing "hammer blow" on the track.
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