Paris Métro Line 3bis in the context of "Paris Métro Line 4"

The Paris Métro, short for Métropolitain, is a rapid transit system serving the Paris metropolitan area in France. A symbol of the city, it is known for its density within the capital's territorial limits, as well as its uniform architecture and historical entrances influenced by Art Nouveau. The system is 245.6 kilometres (152.6 mi) long, mostly underground, as well as its 321 stations of which 61 allow the riders to transfer between the sixteen lines (with an additional four under construction and one in project), all numbered 1 to 14, with two extra branches, 3bis and 7bis, named such as they are former parts of Lines 3 and 7 respectively. Three of these lines (1, 4 and 14) are fully automated, and the additional four are also planned as such. Lines are identified on maps by an individual number and an associated specific colour, all part of an official palette, with the traveling direction indicated by the terminus, the last stop on each line. All trains travel from one end of the line to the other, serving every station along the way. The Paris Métro is operated by the Régie autonome des transports parisiens (RATP), which also operates part of the RER (commuter standard train) network, most of the Francilian light rail lines and many bus routes around and within Paris itself.

It is the second-busiest metro system in Europe, as well as the twelfth-busiest in the world. It carried 1.476 billion passengers in 2024, roughly 4.04 million passengers a day, which makes it the most used public transport system in Paris. It is one of the densest metro systems in the world, with 244 stations within the 105.4 km (41 sq mi) of the City of Paris. Châtelet–Les Halles, with five Métro and three RER commuter rail lines, is one of the world's largest metro stations. The system generally has poor accessibility due to its old age (established 125 years ago) and because most of the current infrastructure was built before accessibility standards emerged, with few stations retrofitted since. On the flip side, all new infrastructure and rolling stock meets current accessiblity standards, including extensions of historic lines.

Paris Métro Line 7bis is one of the sixteen subway lines currently open on the Paris Métro. It connects Louis Blanc, in the 10th arrondissement to Pré Saint-Gervais in the 19th arrondisement in the north-eastern part of the city. With a length of 3.1 kilometres (1.9 mi) and eight stations, the line is the second shortest on the Paris Métro, only longer than Line 3bis.

The line was opened in 1911, then operating as a branch of Line 7. However, due to a large difference in passenger numbers between this branch and the other Line 7 branch (then operating from Louis Blanc to the Porte de La Vilette station), the Pré-Saint-Gervais branch was separated from Line 7, forming the current Line 7bis.

Paris Métro Line 3 (French: Ligne 3 du métro de Paris) is one of the sixteen currently open lines of the Paris Métro. It connects Pont de Levallois–Bécon station in the near northwestern suburban city of Levallois-Perret to Gallieni, in the eastern suburban city of Bagnolet. After opening as the network's third line in 1904, it was subject to several extensions, including the major restructuring occurring of1971, where the line switched its easternmost section from Porte des Lilas to Gallieni, the abandoned section becoming Line 3bis.

With a length of 11.7 km (7 mi), Line 3 crosses Paris from west to east completely on the Rive Droite, serving the residential areas of the 17th arrondissement, the Gare Saint-Lazare, important stores and shopping centres, the Opéra Garnier, the former Parisian stock exchange house, the Place de la République, and the Père Lachaise graveyard. In 2017, it carried 101.4 million riders, making it the tenth busiest line of the Métro network.

Paris Métro Line 8 (French: Ligne 8 du métro de Paris) is one of the sixteen lines of the Paris Métro currently opened. It connects Balard (Porte de Sèvres) in the southwestern part of Paris to Pointe du Lac station in the southeastern suburban city of Créteil, prefecture of the Val-de-Marne department, following a parabolic route across Paris. Last line proposed by Fulgence Bienvenüe's original 1898 Paris Métro project, line 8 opened in July 1913 and was initially intended to link Porte d'Auteuil and Opéra. With 105.5 million passengers in 2017, it is the network's eighth busiest line, as well as the current third longest (after Lines 13 and 14, even though Line 13 has a fork, and Line 15 is set to become the longest once fully opened), at 23.4 km (14.5 mi) in length. Alongside Line 7, it serves 38 distinct stations, the most of any line on the network, Grand Paris Express (lines 15 to 18) included. Line 8 interchanges with all other Métro lines but three : Lines 2, 3bis and 7bis.

The line was substantially modified during the 1930s as Line 10 took over the western section from La Motte - Picquet to Porte d'Auteuil. The current route serves the southwestern part of the French Capital, including the Champ de Mars, the Invalides, the Concorde Place, the Opéra Garnier, the Grands Boulevards, The places of République and Bastille as well as the Bois de Vincennes, before ending in the southeastern inner suburbs through the communes of Charenton-le-Pont, Maisons-Alfort and Créteil, which the line reached in 1974 at Créteil–Préfecture station, after several extensions. Line 8 was the first to connect the prefecture of one of the new departments of Île-de-France, more than a decade before Line 5 to Bobigny, and Line 15 to Nanterre in the near-future. Line 8 is also the only Paris underground line to cross the Seine and its principal tributary, the Marne river, above ground via a bridge between Charenton – Écoles and École Vétérinaire de Maisons-Alfort, it also crosses the Seine underground between Concorde and Invalides.

Gambetta (French: [ɡɑ̃bɛta] ) is a station of the Paris Métro. It serves Line 3 and is the southern terminus of Line 3bis. It is located in the 20th arrondissement of Paris.

Porte des Lilas station (French pronunciation: [pɔʁt de lilɑ]) is a station of the Paris Métro. It serves Line 11 and is the northern terminus of Line 3bis. Located on the edge of the 19th and 20th arrondissements of Paris, it serves the neighborhood of the Porte des Lilas. The station is named after the nearby Porte des Lilas, a gate in the nineteenth century Thiers Wall of Paris, which led to the town of Les Lilas.

The station was referred to in Serge Gainsbourg's famous 1958 chanson "Le poinçonneur des Lilas" about the ennui of a Métro employee's workday. A Scopitone music video for the song was filmed in Porte des Lilas, showing the singer in a Métro uniform, punching tickets.

The MF 67 (French: Métro Fer appel d'offres de 1967; English: Steel-wheeled metro ordered in 1967) is a fleet of steel-wheel electric multiple unit trains for the Paris Métro. The first MF 67 trains entered service on Line 3 in June 1968, and became one of the biggest orders for the Métro, with 1,482 cars constructed. The need to replace the Sprague-Thomson fleet, as well as increasing costs associated with the later-cancelled plan to introduce rubber-tyred trains on all Métro lines, were the main factors for the size of the order.

At its peak, during the late-1980s and the early-1990s, the MF 67 operated on eight of the (then) fifteen Métro lines (Lines 2, 3 and 3bis, 5, 7bis, 9, 10 and 12): the MF 67 also operated on Lines 7, 8 and 13 (including the old Line 14), all before the introduction of the MF 77 in 1978.