A duplex locomotive is a steam locomotive that divides the driving force on its wheels by using two pairs of cylinders rigidly mounted to a single locomotive frame; it is not an articulated locomotive. The concept was first used in France in 1863, but was particularly developed in the early 1930s by the Baldwin Locomotive Works, the largest commercial builder of steam locomotives in North America, under the supervision of its then chief engineer, Ralph P. Johnson.
Prior to this, the term duplex locomotive was sometimes applied to articulated locomotives in general.
Read more about Duplex Locomotive: Drawbacks of The 2-cylinder Locomotive, The Duplex Solution, Baltimore and Ohio Class N-1 #5600 George H. Emerson, PRR Class S1, PRR Class T1, PRR Q1, PRR Q2, A Successful French Duplex, Ending
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