Summer 2026: Beware of construction work on public transport!

This summer 2026, Île-de-France Mobilités is launching an unprecedented works program on the Île-de-France network.

Every summer, construction work resumes on the Île-de-France public transport network. In 2026, it reaches an exceptional level with nearly 4 billion euros invested in the modernization, regeneration, and development of infrastructure. These projects aim to prepare the network of tomorrow: more reliable, more capable, more interconnected, and better suited to the daily needs of the 12 million residents of Île-de-France.

Far from being merely a period of inconvenience, this summer marks a decisive step in the major transformation of regional transport, particularly in anticipation of the gradual opening of the new lines of the Grand Paris Express.

Why these works?

The Île-de-France network, one of the busiest in the world, suffers from aging infrastructure. To maintain a high level of service and accommodate new rolling stock, heavy interventions are necessary.

These works will notably allow:

• To operate a metro every 85 seconds on line 14;
• To integrate the new MI20 trains on the RER B;
• To extend and connect metro lines to better serve the regions.

Without these phases of intensive work, it would be impossible to achieve the performance and development objectives of the network.

The three major objectives of the summer 2026 works

1. Improve comfort, punctuality, and safety for travelers: Complete renovation of stations, replacement of elevators, refurbishment of platforms, and modernization of signaling, switching, and ventilation systems. These interventions aim to reduce technical incidents and provide a more pleasant environment for passengers.
2. Prepare for the arrival of new trains and metros. The projects anticipate the massive arrival of new equipment:
   • The MI20, a new double-deck train for the RER B, more spacious and air-conditioned;
   • The MF19, the future metro that will gradually equip half of the metro lines by 2030, with larger, more accessible, and connected trains.
3. Develop and interconnect the network: The works support the historic expansion of the metro with lines 15, 16, 17, and 18 of the Grand Paris Express. Line 18 will also open a first section in 2026, marking a concrete advance in connecting Paris with the outer suburbs.

Which lines will be affected this summer?

Disruptions will affect a large part of the network:

• RER: lines A, B, C, D, and E
• Metro: lines 4, 5, 8, 12, and 13
• Transilien: lines H, K, and P
• Trams: T1 and T2
• Cable: line C1

Some lines will experience total or partial closures, frequency reductions, or modified endpoints. Detailed information regarding dates, times, and impacts is available on the official Île-de-France Mobilités website.

How to travel during the works?

Building on the successful experience of the Paris 2024 Olympic and Paralympic Games, Île-de-France Mobilités has established a centralized and ultra-practical information system:

• A dedicated web page that lists all works by line, with precise dates and alternative routes;
• Replacement buses established on the most impacted routes;
• An efficient route planner that incorporates real-time disruptions;
• The Île-de-France Mobilités app (available on iOS and Android), continuously updated, which has become the essential tool for all travel.

Practical tips to limit inconveniences

To get through this summer as smoothly as possible, Île-de-France Mobilités recommends:

• Encourage telecommuting when possible and avoid rush hours (7 AM-10 AM and 4 PM-8 PM).
• Prefer walking or cycling for short trips.
• Use carpooling, a solution now integrated into the annual Navigo subscription.
• Plan trips the day before using the app and allow for safety margins.

Despite the inevitable constraints, these summer 2026 works represent a long-term investment. They will ultimately reduce delays, increase transport capacity, and better connect the territories of Île-de-France.

By staying well-informed and adapting their habits, travelers will also contribute to the success of this major transformation. Regularly consult the Île-de-France Mobilités website and app to follow the progress of the works in real time.

Summer 2026 will be a construction season… but it is primarily preparing the daily life of tomorrow.

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