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Black and white photograph of a Pacific P.O. locomotive No. 4501, the first of its type in Europe, dated July 1907. The reverse details its technical characteristics: 4 cylinders, 16 hpz engine, 4.27 m² grate, coupled wheels of 0.650 m, and a service weight of 91,000 kg. The edition is by S.A.C.M., No. 173, dated 1957.