Tramways in Île-de-France

Line T1 currently connects Asnières and Gennevilliers to Noisy-le-Sec, parallel to the Paris city's northern limit. It opened in 1992 from Saint Denis' train/RER station to Bobigny — Pablo Picasso subway station, where is located the Prefecture for the Seine-Saint-Denis department. The extension from Bobigny to Noisy-le-Sec was completed in December 2003. An extension west to Asnières and Gennevilliers, connecting to western branch of subway line 13, opened in November 2012, and a continuation towards Nanterre is planned. An eastwards extension to Montreuil and to the Val de Fontenay RER station is planned.

Line T2 (Trans Val-de-Seine) connects the bridge of Bezons (Pont de Bezons) to the Porte de Versailles (Paris's main exhibit grounds) via La Défense and Issy-les-Moulineaux business districts. It opened in 1997 between La Défense and Issy Val-de-Seine train stations, mostly on a former SNCF line, the Moulineaux line (which closed in 1993). An extension south, from Issy Val-de-Seine to Porte de Versailles opened in 2009, while the second extension, to the north this time, opened in 2012 from La Défense to Pont de Bezons.

Line T3 is the first modern tramway line to actually enter Paris itself. It is divided into two sections, called T3a and T3b, separated at the Porte de Vincennes in order not to cut the road traffic there, despite rail and electrical infrastructure being present and operational. The line is also known as the tramway des Maréchaux because it follows the Boulevards of the Marshals, a series of boulevards that encircle Paris along the route of the former Thiers Wall (built 1841–44). The boulevards are, with three exceptions, named for Napoleon's First Empire marshals (maréchaux).

T3a connects Pont du Garigliano RER station in the western part of the 15th arrondissement with Porte de Vincennes metro station in the 12th arrondissement. T3b connects Porte de Vincennes with Porte de la Chapelle in the 18th arrondissement, this with an extension to Porte d'Asnières (17th arrondissement), mostly built and set to open in November 2018. The extension opened on 24 November 2018.[11]

Line T4 is an 8-kilometre (5.0 mi), 11-stop[2] tram-train line, operating in part on SNCF lines, connecting Bondy Train/RER station with Aulnay-sous-Bois Train/RER station. It opened on November 18, 2006. Unlike the other tramways in Île-de-France, T4 is operated by SNCF. A new branch of this tram-train line, heading east towards Montfermeil; will open in 2020.

Tramway T5[12] is a Translohr tram-on-tyres[13] running along a mainly segregated "track" on the busy Route Nationale 1 (similar to the systems in Nancy or Caen), replacing the often busy bus lines 168 and 268. The 6.6-kilometre (4.1 mi) route[13] serves 16 stops[13] between Saint-Denis, Pierrefitte-sur-Seine, Sarcelles and Garges-lès-Gonesse. It has an interchange with T1 at its southerly terminus marché de Saint-Denis and with RER D at its northern terminus, the Garges-Sarcelles RER station.[14] Line T5 opened in July 2013.[15]

Tramway line 6 is a 14-kilometre (8.7 mi) Translohr tram-on-tyres serving 21 stations, from Châtillon – Montrouge subway station (the southern terminus of metro line 13) to Viroflay-Rive-Droite Transilien station. The 1.6 kilometres (0.99 mi) serving at the western (Viroflay) end, is in a tunnel crossing the city from south to north, including 2 stops, namely the two Train stations the city has, Rive Gauche (train lines C & N) and Rive Droite (line L). The majority of the current line opened in 2014, with said tunnel section opening in 2016. Replaced bus line 295, that became too crowded and slow for proper use.

Tramway line 7 is an 11.2-kilometre (7.0 mi) route serving 18 stations[8] between Villejuif — Louis Aragon (southwestern terminus of Paris Métro Line 7) and Athis-Mons, via Rungis International Market and Orly airport ; which opened on November 16, 2013.[16] in order to both allow a supplemental rail service from Paris to the Orly airport and replace bus line 285, that also became crowded beyond reason.

Formerly known as "Tram'y" due to its opening day Y-shape, this 8.46-kilometre (5.26 mi) line goes from Saint-Denis — Porte de Paris subway station to Épinay-sur-Seine — Orgemont, with a branch to the university of Villetaneuse, where it connects to the new T11 line. An extension is also planned south, to Paris itself, at the Rosa Parks RER station. Construction began in 2010, and service began in 2014.[16]

First "Express" tram line of the parisian network — due to reusing the long-closed Grande Ceinture, with only a handful of stations in — , Tramway line 11 is actually the most recent tramway line of the Parisian network, serving as the first of 3 lines to cover the former Grande Ceinture rail line and offering eventually a second circular railroad service around Paris, something the Paris public transport system sorely lacked for many years

T11 line opened in 2017 between Épinay-sur-Seine and Le Bourget RER/Train stations, the middle part of its expected full route between Sartrouville & Noisy-le-Sec RER/Train Stations .

T9 is a tram line currently under construction between Porte de Choisy Paris Métro station and the centre of Orly with a length of 10.3 km (6.4 mi) and 19 stops.

T10 is a planned tram route from Antony to Clamart in the southwestern suburbs of Paris with a length of 8.2 km (5.1 mi) and 14 stops.

T12 Express is a tram-train line currently under construction between Évry-Courcouronnes station (RER D) and Massy-Palaiseau station (RER B and C) via Épinay-sur-Orge station (RER C), with a length of 20 km (12 mi) and 16 stops.

T13 Express is a tram-train line currently under construction between Saint-Germain-en-Laye station (RER A) and Saint-Cyr station (RER C and Transilien lines N and U) with a length of 18.8 km (11.7 mi) and 11 stops.