Things are moving on the tramway T1. In the Hauts-de-Seine (92), the extension of the region’s oldest tram line westward is finally taking shape, with a target for service by 2031 on the section between Nanterre and Rueil-Malmaison. After years of waiting and accumulated delays, the timeline is starting to come into focus. Here’s the update.
This announcement comes as the line is finding its stride again. Two sections closed for works will reopen in this 2026 back-to-school period: to the east, between Noisy-le-Sec and Bobigny - Pablo Picasso on August 31, then to the west, from Saint-Denis to Asnières - Quatre Routes on September 1.
The project, led by Île-de-France Mobilités and the Hauts-de-Seine Department, aims to connect the Petit-Colombes district to the Château de Malmaison. In total, 15 additional stations will be added, spaced about 500 meters apart on a 7.5-kilometer corridor that will serve Nanterre and Rueil-Malmaison.
The main value of this extension lies in its connections. The line will link into the backbone network at several strategic junctions:
Aim to bring a vast urban catchment in western Île-de-France to the doorstep of La Défense, the business district. The proposed route would serve an area of roughly 170,000 residents and 146,000 jobs, spanning Petit-Nanterre, Paris Nanterre University, the prefecture, and the town centers of Nanterre and Rueil-Malmaison.
That’s where the timetable serves up a little surprise. The western extension advances in two distinct phases, and the farthest section will open before the one nearest Paris.
The section between Nanterre and Rueil-Malmaison (the famous fifteen stations) is now targeting an opening by late 2031. The Colombes section, which includes eleven new stations, one of them opposite the Yves-du-Manoir stadium (where Racing 92 is set to return to play), is expected around 2032, whereas it had originally been planned for 2024. For a few months, the Nanterre–Rueil stretch should therefore operate in isolation, before being connected to the rest of the line the following year.
Once the project is fully finished, the T1 tram will cover nearly 40 km, running east to west from Val de Fontenay to Rueil-Malmaison. In the western stretch, count about 26 minutes between Le Petit-Colombes and the Château de Malmaison, with a tram every 4 minutes during peak times. The line will operate on a dedicated track, with priority at intersections, seven days a week, and stations fully accessible to people with reduced mobility.
The project, declared of public utility at the end of 2020, has already faced numerous delays. Those milestones remain estimates and may shift as the work unfolds. Local residents can monitor the progress of the works via the site officiel du prolongement Asnières-Colombes and the public meetings regularly held by the municipalities involved.
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