Inside the T12 tram

New tram line T12 now in service in the Paris region

Inside the T12 tram Île-de-France Mobilités

Following tests, Alstom’s Citadis Dualis tram-trains were officially launched on the Île-de-France Mobilités network’s T12 line. They started their service on Sunday 10 December 2023 at 5.00 AM after an inauguration ceremony on 9 December. The new tram-train establishes a connection between two significant centres in the Essonne region—Évry-Courcouronnes and Massy-Palaiseau, in the suburbs of the French capital.

Each day, an estimated 40,000 passengers will make use of the new T12 line. The Citadis Dualis tram-trains blend the high-speed characteristics of a train with the urban operational efficiency of a tramway. They traverse both the National Rail Network, covering the stretch between Massy and Épinay-sur-Orge on line T12, and dedicated urban tracks extending from Épinay-sur-Orge to Évry-Courcouronnes. Capable of navigating urban environments with tramway gauge and delivering train-like performance for inter-city travel, this configuration eliminates the need for modal changes.

Testing of the Citadis Dualis vehicles was supervised by Île-de-France Mobilités, SNCF Réseau, and SNCF Voyageurs.

Inauguration of the T12 tram (Photo: Île-de-France Mobilités on LinkedIn)
Inauguration of the T12 tram (Photo: Île-de-France Mobilités on LinkedIn)

Additionally, in collaboration with TSO (leading the consortium) and Terideal, Alstom played a key role in constructing the new 10-kilometre tramway track connecting Épinay-sur-Orge and Évry-Courcouronnes for the T12 line. The existing tracks between Massy-Palaiseau and Épinay-sur-Orge are also utilised by the line. The 20.4-kilometre route connects Massy to Évry-Courcouronnes in 39 minutes, passing through 13 municipalities in the Essonne department, in the French Île-de-France region.

T12 route
T12 route (Image: Grand-Orly Seine Bièvre)

The project’s infrastructure costs 526 million euros and is financed at 4 per cent by SNCF, 5 per cent by the IDF region, 10 per cent by the Essonne department, and 30 per cent by the French state. Additionally, an extra 145 million, fully funded by IDFM, was allocated for the 25 Dualis Alstom trams. The operation and maintenance of the line will also be carried out by IDFM. The operation of this new tram line is entrusted to TransKeo (SNCF/Keolis), which already operates the T11 and T13 trams on behalf of Île-de-France Mobilités.

Citadis Dualis

The Dualis tram has a transport capacity of 251 passengers, with 92 seats. It will operate in a double configuration (two coupled trams), allowing for the transportation of over 500 passengers with 190 seats. In total, the vehicle will have a length of 84 metres and a width of 2.65 metres. The trams are fully accessible and air-conditioned.

Inside the T12 tram (Photo: Île-de-France Mobilités)
Inside the T12 tram (Photo: Île-de-France Mobilités)

The Citadis Dualis is designed and assembled at Alstom’s Valenciennes Petite-Forêt site, with the participation of 6 other Alstom sites in France. The Citadis Dualis tram-train, crafted entirely in France, involves the collaboration of seven out of Alstom’s 16 sites in the country. The Valenciennes site was responsible for design, production, assembly, validation, and testing. The Le Creusot Alstom site focuses on bogies, Ornans on motors, and Petit-Quevilly on transformers. Villeurbanne contributes to onboard electronics, Tarbes specialises in power traction, and Saint-Ouen is a vital site for design.

T12 trams
T12 Citadis-Dualis trams

In the Île-de-France region, a fleet of 77 Alstom Citadis Dualis trains, entirely funded by Ile-de-France Mobilités, is now operational. These trains are strategically distributed across multiple lines, serving key routes since their introduction. Since July 2017, 15 trains have been facilitating travel on line T11 (Épinay-sur-Seine – Le Bourget) and, as of March 2022, on the Transilien line P (Esby – Crécy-la-Chapelle section).

Additionally, 26 trains have been in service on line T4 (Bondy – Aulnay-sous-Bois or Montfermeil) since December 2019. The deployment extends to line T13 (Saint-Cyr-l’École – Saint-Germain-en-Laye) with 11 trains in operation since July 2022. Finally, line T12 (Evry-Courcouronnes – Massy-Palaiseau) benefits from 25 trains, contributing to the public transportation system in the region.

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Author: Emma Dailey

Emma Dailey is an editor at and

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