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Postcard illustrating the French locomotive no. 20-251, a 4-cylinder compound engine, built in 1909–1910. The reverse details its technical specifications: boiler surface area 206 m², diameter of driving wheels 1 m 750, weight empty 47,450 kg, and total adhesion weight 65,510 kg. The publisher is F. Flettre, 49, rue de la République, Paris.