To accommodate these changes, Gambetta, which at the time consisted of only two half-stations, underwent major alteration. The southern half-station was demolished and the northern half-station was renovated to become the terminus of the new line 3bis, with two tracks on either side of a central platform. New tracks were constructed for line 3, and the station Martin Nadaud, which was only from the old stations (under the square of the same name), was closed. The new platforms are on the site of this old station, in the direction of Pont de Levallois; this explains the longer-than-normal platforms at Gambetta.