Tramway line T3 is the first modern tramway in Paris proper. Opened on 16 December 2006, it is known as the tramway des Maréchaux because it follows the boulevards des maréchaux, 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). The tramway line connects Boulevard Victor – Pont du Garigliano RER station in the western part of the XV^e arrondissement with Porte d'Ivry metro station in the XIII^e arrondissement.

The line carries 112 000 people per day. Work began in early 2009 on a 14.5 km extension from Porte d’Ivry to Porte de la Chapelle, via Porte de Charenton. This was expected to be completed by 2012. The extension project was then split into a smaller extension from Porte d’Ivry and a separate tramway line to Porte de la Chapelle.

The material selected to power the T3 is the Alstom Citadis 402.

The trains, ordered in December 2003, are manufactured in factories at Le Creusot (bogies), Tarbes (electrical and electronic traction), Villeurbanne (electronics), Ornans (engines) and assembled at the factory of Aytré, near La Rochelle.

Coordinates: 48°51′24″N 2°21′03″E / 48.8567°N 2.3508°E / 48.8567; 2.3508

Paris (ⁱ/ˈpærɨs/; French: [paʁi] ( listen)) is the capital and largest city of France. It is situated on the river Seine, in northern France, at the heart of the Île-de-France region (or Paris Region, French: Région parisienne). As of January 2008 the city of Paris, within its administrative limits (the 20 arrondissements) largely unchanged since 1860, has an estimated population of 2,211,297 and a metropolitan population of 12,089,098, and is one of the most populated metropolitan areas in Europe. Paris was the largest city in the Western world for about 1,000 years, prior to the 19th century, and the largest in the entire world between the 16th and 19th centuries.

Paris is today one of the world's leading business and cultural centres, and its influences in politics, education, entertainment, media, fashion, science, and the arts all contribute to its status as one of the world's major global cities. It hosts the headquarters of many international organizations such as UNESCO, the OECD, the International Chamber of Commerce or the European Space Agency. Paris is considered one of the greenest and most liveable cities in Europe. It is also one of the most expensive.

3 Line or Line 3 can refer to the following: