Editing Paris Métro (section)

=== Nord-Sud competing network ===
{{Main|Nord-Sud Company}}
[[File:Entrée métro de Paris Compagnie Nord-Sud.jpg|thumb|upright|A ''Nord-Sud'' station sign]]
On 31 January 1904, a second concession was granted to the ''Société du chemin de fer électrique souterrain Nord-Sud de Paris'' (Paris North-South underground electrical railway company), abbreviated to the ''Nord-Sud'' (North-South) company. It was responsible for building three proposed lines:
* Line A would join [[Montmartre]] to [[Montparnasse]] as an additional north–south line to the west of Line 4.
* Line B would serve the north-west of Paris by connecting [[Gare Saint-Lazare|Saint-Lazare station]] to Porte de Clichy and Porte de Saint-Ouen.
* Line C would serve the south-west by connecting [[Gare Montparnasse|Montparnasse station]] to [[Porte de Vanves (Paris Métro)|Porte de Vanves]]. The aim was to connect Line B with Line C, but the CMP renamed Line B as Line 13 and Line C as Line 14. Both were connected by the RATP as the current Line&nbsp;13.

Line A was inaugurated on 4 November 1910, after being postponed because of floods in January that year. Line B was inaugurated on 26 February 1911. Because of the high construction costs, the construction of line C was postponed. Nord-Sud and CMP used compatible trains that could be used on both networks, but CMP trains used 600 volts third rail, and NS −600 volts overhead wire and +600 volts third rail. This was necessary because of steep gradients on NS lines. NS distinguished itself from its competitor with the high-quality decoration of its stations, the trains' extreme comfort and pretty lighting.

Nord-Sud did not become profitable and bankruptcy became unavoidable. By the end of 1930, the CMP bought Nord-Sud. Line A became [[Paris Métro Line 12|Line 12]] and Line B [[Paris Métro Line 13|Line&nbsp;13]]. Line C was built and renamed [[Paris Métro Line 14 (1937–76)|Line&nbsp;14]]; that line was reorganised in 1937 with Lines 8 and 10. This partial line is now the south part of Line&nbsp;13.

The last Nord-Sud train set was decommissioned on 15 May 1972.<ref>{{Cite web |language=fr |url=http://www.amtuir.org/04_htu_metro_paris/cmp_1968_1983/cmp_1968_1983.htm |title=1968–1983 : le RER et la modernisation du réseau parisien |trans-title=1968–1983: The RER and the modernisation of the parisian network |work=Musée des Transports – Histoire du Métropolitain de Paris |access-date=6 February 2011 |archive-date=18 July 2011 |archive-url=https://web.archive.org/web/20110718154659/http://www.amtuir.org/04_htu_metro_paris/cmp_1968_1983/cmp_1968_1983.htm |url-status=live }}</ref>