In 1949 the functions of the CMP were taken over by the newly formed RATP.
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The Compagnie du chemin de fer métropolitain de Paris (Paris Metropolitan Railway Company), or CMP, was the forerunner of the RATP, the company managing the Parisian Underground.
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Though these were never realised, Berlier was heavily involved with the Paris Metro from its opening in 1900 and indeed was one of the key instigators of the Société du chemin de fer électrique souterrain Nord-Sud de Paris which went on to build two privately funded lines that were later absorbed by the Compagnie du chemin de fer métropolitain de Paris, and are still in use today as (parts of) Paris Métro Line 12 and Paris Métro Line 13.