Editing Paris Métro (section)

=== 1930–1950: first inner suburbs are reached ===
[[File:Métro parisien état du réseau en 1939.jpeg|thumb|240px|left|Paris Métro network in 1939]]
Bienvenüe's project was nearly completed during the 1920s. Paris planned three new lines and extensions of most lines to the inner suburbs, despite the reluctance of Parisians. Bienvenüe's inner circular line having been abandoned, the already-built portion between Duroc and Odéon for the creation of a new east–west line that became [[Paris Métro Line 10|Line 10]], extended west to Porte de Saint-Cloud and the inner suburbs of [[Boulogne-Billancourt|Boulogne]].

The line C planned by Nord-Sud between Montparnasse station and [[Porte de Vanves (Paris Métro)|Porte de Vanves]] was built as [[Paris Métro Line 14 before 1976|Line 14]] (different from [[Paris Métro Line 14|present Line&nbsp;14]]). It extended north in encompassing the already-built portion between Invalides and Duroc, initially planned as part of the inner circular. The over-busy [[Belleville funicular tramway]] would be replaced by a new line, [[Paris Métro Line 11|Line 11]], extended to [[Châtelet (Paris Métro)|Châtelet]]. Lines 10, 11 and 14 were thus the three new lines envisaged under this plan.

Most lines would be extended to the inner suburbs. The first to leave the city proper was Line 9, extended in 1934 to [[Boulogne-Billancourt]]; more followed in the 1930s. World War II forced authorities to abandon projects such as the extension of Line 4 and Line 12 to the northern suburbs. By 1949, eight lines had been extended: Line 1 to [[Neuilly-sur-Seine]] and [[Vincennes]], Line 3 to [[Levallois-Perret]], Line 5 to [[Pantin]], Line 7 to [[Ivry-sur-Seine]], Line 8 to [[Charenton-le-Pont|Charenton]], Line 9 to Boulogne-Billancourt, Line 11 to [[Les Lilas]] and Line 12 to [[Issy-les-Moulineaux]].

World War II had a massive impact on the Métro. Services were limited and many stations closed. The risk of bombing meant the service between [[Place d'Italie (Paris Métro)|Place d'Italie]] and [[Charles de Gaulle – Étoile (Paris Métro and RER)|Étoile]] was transferred from Line 5 to Line&nbsp;6, so that most of the elevated portions of the Métro would be on Line 6.{{Clarify|date=November 2024}} As a result, Lines 2 and 6 now form a circle. Most stations were too shallow to be used as bomb shelters. The [[French Resistance]] used the tunnels to conduct swift assaults throughout Paris.{{sfnp|Bobrick|1981|p=286}}

It took a long time to recover after liberation in 1944. Many stations had not reopened by the 1960s and some closed for good.{{cn|date=January 2024}} On 23 March 1948, the CMP (the underground) and the STCRP (bus and tramways) merged to form the [[RATP Group|RATP]], which still operates the Métro.