Île-de-France tramway Lines 3a and 3b

• 16 December 2006: enters service between Pont du Garigliano and Porte d'Ivry under the designation T3.
• 18 June 2008: speed increased from 16 km/h to 18 km/h.
• 15 December 2012: extension from Porte d'Ivry to Porte de Vincennes enters service as Line T3a.

The Little Ring Line (Ligne de la Petite Ceinture) was constructed in order to link the major rail supply routes within the Thiers Fortifications that surrounded Paris. The line was opened in sections between 1852 and 1869, reaching a total length of 32 km (20 mi) and encircling Paris within the boulevards des Maréchaux.

Initially, the line was for the exclusive use of freight traffic, before subsequently opening to passenger traffic. The Ligne d'Auteuil, in contrast, opened to passengers only immediately in 1854, and only opened to freight in 1867. The railway saw a rapid growth in passenger numbers towards the end of the 19th century, especially during the Universal Expositions. However, the inappropriateness of the equipment, consisting of steam locomotives that made the cars hot and uncomfortable, made the line less and less attractive, and it was unable to resist competition from the Métro.

After 1900, passenger numbers saw a constant and relentless fall until, in April 1934, despite several failed attempts to improve the situation, the line permanently closed to passengers, except the Ligne d'Auteuil, which remained open until January 1985. Some months later, in July 1934, the PC Bus Line was created, and was an immediate success.

Freight traffic also disappeared at the start of the 1990s, and most of the line has since been abandoned and split by modern development. The section of the Ligne d'Auteuil between Pereire-Levallois and Avenue Henri-Martin, however, was integrated with RER C of the commuter rail network (Réseau Express Régional).