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Postcard showing a P.O.-MIDI locomotive of type 231-722 to 231-731, transformed in 1934 into a Compound model. The reverse details its technical characteristics: 4 cylinders, superheating, 17 hpz, 4.3 m² grate, coupled wheels 1.95 m, service weight 102,500 kg, and mentions the photo by H. Fohanno. The publisher is « La Vie du Rail », edition 1957, N° 176.