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Postcard showing the steam locomotive P 12 n° 240 with Houlet superheater, used for heavy express trains. The reverse details its technical specifications: cylinders H P 440x650 mm, B P 650x390 mm, service weight 112.800 kg, and mentions the Paris interchange reproduction. The publisher is H.M. P., 8 rue de Tournon - XI - 43, with the photographer's signature L. Vilain.