2021 – Activity and sustainable development report

Projects that change the city

With approximately €2.4 billion invested in 2021, the Île‑de‑France region network continues its transformation, in accordance with the contract between RATP and Île‑de‑France Mobilités and with the Grand Paris network on the way. The aim is to continue network growth, and to upgrade and maintain transport systems, infrastructure, maintenance and rolling stock for the benefit of passengers.


Several major projects have enabled us to make a major leap forward this year in terms of image and service, with the support of various funding bodies: State, Region, departmental councils and the City of Paris. With an additional 1.8 kilometres of track and two new stations, metro line 4 has been extended to Bagneux, an extension eagerly awaited by Montrouge and Bagneux residents, and by the 37,000 additional passengers who use metro line 4 every day at Barbara and Bagneux - Lucie‑Aubrac stations. The line is also currently being automated. The first trials of automated trains started in 2021, in preparation for automation planned for the end of 2023. Following on from metro line 1, this new project, being completed without any major disruption to traffic, further advances the teams’ expertise: the new platform-edge doors, installed during the night, came into operation the following day. Île‑de‑France residents can also draw satisfaction from progress with the RER station upgrade programme, with 6 new stations renovated in 2021 and Auber station on track for completion. All these are visible signs of a proactive policy to provide a better travel experience.


In addition to the transformation of the existing network, there are the Grand Paris Express projects, which will also have a structural impact on the Île‑de‑France region. After the inauguration of Porte‑de‑Clichy station in early 2021 and the northern extension of metro line 14 to Mairie de Saint‑Ouen, work is now under way on the southern extension, between Olympiades and Aéroport d’Orly stations. This extension should make it possible to increase the number of direct connections with other transport infrastructure, notably Gare de Lyon and Gare Saint‑Lazare, and with the future high-speed line of the Atlantic corridor, which bypasses Paris to the south. As soon as it is commissioned, it will also help reduce journey times for Île‑de‑France residents. Now that the tunnel boring machines have completed excavation of the 14 kilometres required for this underground line, the fitting-out work can begin.

  • 8.4bn
    in investment in 2021‑2024 under the Île‑de‑France Mobilités contract
  • 60%
    of the RATP train fleet renewed by 2035
  • 2
    metro lines

    (4 and 12) extended in 2022