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Alfred George de Glehn (15 September 1848 – 8 June 1936) was a notable English-born French designer of steam locomotives and an engineer with the Société Alsacienne de Constructions Mécaniques (SACM). His steam engines of the 1890s combined elegance, high speed, and efficiency. De Glehn's express locomotives were first used on the Nord Railway and on the boat trains from Calais to Paris, where they impressed passengers with their speed.
He invented the Glehn system of compounding, and De Glehn types were built in large numbers in France, and were also built in smaller numbers in Belgium, Germany, New Zealand, and Russia, see Compound locomotive. Compounding lost favour from the 1900s, being replaced by superheating. However André Chapelon rebuilt many of the French De Glehn compounds from 1929 onwards.