Bus (RATP) in the context of "Régie Autonome des Transports Parisiens"

The Île-de-France tramways (French: Tramways d'Île-de-France) is a network of modern tram lines in the Île-de-France region of France. Fifteen lines are currently operational (counting Lines T3a and T3b as separate lines), with extensions and additional lines in both construction and planning stages. Although the system mainly runs in the suburban regions of Paris, lines T3a and T3b run entirely within Paris city limits, serving as a high capacity ring line replacing the Petite Ceinture bus route. Lines T2 and T9, on another hand, start their routes within Paris's borders before heading out. While lines operate independently of each other and are generally not connected, some connections do exist: between lines T2 and T3a (at the Porte de Versailles station, since 2009), T3a and T3b (at the Porte de Vincennes station, since 2012), T1 and T5 (at the Marché de Saint-Denis station, since 2013), T1 and T8 (at the Saint-Denis train station, since 2014), T8 and T11 (at both Villetaneuse-Université and Épinay-sur-Seine stations, since 2017), T3a and T9 (at the Porte de Choisy station, since 2021) and T6 and T10 (at Hôpital Béclère, since 2023). However, the final design of the entire planned tram network is fairly integrated. (The prefix "T" in tram line numbers avoids confusion with the numbering of Paris Métro lines, a pattern followed in other public transport networks such as the new cable car route in Créteil, dubbed C1.)

Most lines (with the exceptions of lines T4, T9, T11, T12, T13, and T14) are operated by the Régie Autonome des Transports Parisiens (RATP), which also operates the Paris Métro and most bus services in the Paris immediate area. Furthermore, while most lines use conventional steel-wheel rolling stock, two lines (T5 and T6) use rubber-tyred trams. Lines T4, T11, T12, T13 and T14 are tram-trains, sharing tracks with main-line railways, and are operated as part of French national rail operator SNCF's Transilien regional rail network.

The Gare du Nord (pronounced [ɡaʁ dy nɔːʁ]; English: North station), officially Paris-Nord, is one of the seven large mainline railway station termini in Paris, France. The station is served by trains that run between the capital and northern France via the Paris–Lille railway, as well as to international destinations in Belgium, Germany, the Netherlands and the United Kingdom. Located in the northern part of Paris near the Gare de l'Est in the 10th arrondissement, the Gare du Nord offers connections with several urban transport lines, including Paris Métro, RER and buses. It is the busiest railway station in Europe by total passenger numbers. In 2015, the Gare du Nord saw more than 700,000 passengers per day.

The current Gare du Nord was designed by French architect Jacques Ignace Hittorff, while the original complex was constructed between 1861 and 1864 on behalf of the Chemin de Fer du Nord company. The station replaced an earlier and much smaller terminal sharing the same name, which was operational between 1846 and 1860. A substantial refurbishment programme during the late 2010s and early 2020s will greatly redesign the station. The plans for this include a significant expansion of the station's footprint and ability to handle passengers, expanding onsite amenities and establishing a new departure terminal in preparation for the 2024 Summer Olympics. As a consequence of this redevelopment, the Gare du Nord will become the largest railway station in Europe.