Behind the Scenes of the Line 4 Extension

Since January 13, 2022, you can travel to Bagneux – Lucie Aubrac station on Line 4. A look back at the project.

Last modified on 26 March 2025

1 min read

Facebook is disabled. Authorize cookies to access to this feature. Allow PersonalizingAddtoany is disabled. Authorize cookies to access to this feature. Allow Personalizing
Twitter is disabled. Authorize cookies to access to this feature. Allow PersonalizingAddtoany is disabled. Authorize cookies to access to this feature. Allow Personalizing
Linkedin is disabled. Authorize cookies to access to this feature. Allow PersonalizingAddtoany is disabled. Authorize cookies to access to this feature. Allow Personalizing

Summary

Technical challenge

The extension of Line 4 was commissioned on January 13, 2022, connecting Mairie de Montrouge station to the new terminus at Bagneux – Lucie Aubrac. Every day, an additional 37,000 passengers use Line 4 at Barbara and Bagneux – Lucie Aubrac stations.

The goal of this extension: to enhance rail service in the inner suburbs. The extended Line 4 is positioned between Metro Line 13 to the west and RER Line B to the east. Connected to the future orbital Metro Line 15, it strengthens the rail network in the Île-de-France region. The project was designed to fully support the urban development of Bagneux and Montrouge, particularly the revitalization initiatives within the Victor Hugo eco-district ZAC in Bagneux.

Extension of Line 4: Behind the Scenes of the Inauguration

The Architecture of the Two New Stations

Extension of Line 4: The Station Names

The Works of C215, a Tribute to Lucie Aubrac

Technical challenge

The extension corresponds to six years of construction works that included a 1.8 km tunnel extension and the construction of 2 new stations in a dense urban environment, as well as the construction of a new 1,500 m2 train repair center. A true technical challenge met by the teams mobilized.

Modernisation