Extension of line 11 of the Paris Metro
As part of a consortium, ETF is extending Line 11 eastwards for its client RATP from Mairie des Lilas station to Rosny-Bois-Perrier.
Signed in December 2017, construction began in 2019 and will last for four years. This extension includes the creation of six new stations over 6.5 km and a maintenance workshop.
The project is divided into two phases:
- Phase 1: The Rosny loop: May 2019 – September 2020
- Phase 2: Tunnel connection between Rosny and Mairie des Lilas: from spring 2021 to 2022.

The new platform will consist of
- 12.6 km of track
- 25.2 km of rails, running tracks and guide bars
- 12 points (4 in line and 8 in AMT)
In order to adapt to the specific characteristics of the environment, several types of track will be constructed: concrete track, ballast track, etc. Up to 100 employees will be mobilised at the peak of activity.