Île-de-France tramway Lines 3a and 3b

Tramway line T3 is the first modern tramway in Paris proper, since the 1937 closure of the previous comparable system. It is operated by the Parisian Transport Authority, and is divided into two sections called T3a and T3b. 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. The boulevards are, with three exceptions, named for Napoleon's First Empire marshals, and were transformed by redevelopment works carried out during the two and a half year construction of the line, which opened on 16 December 2006 under the designation T3.

The line runs in its own section of the roadway of these boulevards between the 15th and 13th arrondissements of Paris, allowing it to connect Pont de Garigliano and Porte d'Ivry in an average of 26 minutes.