work began at the end of 1934. a new section was constructed linking the station "la motte-picquet" in the west to "duroc" in the east with a new intermediate station, "ségur". the reconfiguration of the three lines' routes was planned so to minimize interruption while construction took place. the lines were shut down during a single night, between 26 and 27 july 1937. during this night, teams removed the rails on line 10 on the bend by "duroc", while at the same time others modified the rails by "la motte-picquet". still other teams changed the advisory signs of all involved stations, as well as the line maps in the stations and on the trains. on the morning of 27 july, line 10 was cut in two: from "jussieu" to "duroc" on one part, and from "la motte-picquet" to "porte d'auteuil" on the other. on 29 july, service began from "porte d'auteuil" to "jussieu".