Metro line 4 heading for automation

Launched more than a century ago between Porte d’Orléans and Porte de Clignancourt, line 4 is central to the Paris network, serving the major SNCF stations and strategic hubs like Châtelet. We are now taking up a new technological challenge to better meet passengers’ needs, by launching the complete traffic automation on line 4.

The new shuttles were progressively integrated until the complete automation of the line, which became effective by the end of 2023. As a result, there are now 52 automatic shuttles operating along the entire Line 4.

The line is running during works

Most of the work to automate line 4, including the installation of platform edge doors, is carried out at night, with no effect on daily journeys. However, occasional closures of stations or sections may be staggered over time. Some stations require major works, which may lead to their complete closure for up to three months.

A history of technological innovation

After the successes of the metro metro line and the automation of line metro metro , the automation of line metro metro is a technological challenge that draws on RATP’s unique expertise. This approach, lead with Île-de-France Mobilités, demonstrates our wish to better meet passengers’ needs and the new pace of urban life.

Transformation of the line began in 2016 with the raising of the platforms and continues with the installation of platform edge doors in the stations.

Dernière ligne droite vers l'automatisation

Renovated and Redesigned Spaces

The platforms of the stations will be entirely renovated to enhance the reception and comfort of passengers, offering warm spaces, welcoming seating, updated tiling and flooring, leveled platforms, and new lighting. Currently, the flooring is being installed following the installation of the platform facades.


illustration anoxo
View of future converted platforms

New waiting areas on the platforms

Optimised operation

The automation of line 4 consists in making the trains completely driverless. This requires the upgrading of existing signalling and the development of infrastructure including platforms, platform edge doors, rolling stock and the implementation of the automatic train operating system (SAET).

Controlled and centralised system

The system relies on the centralised control room, and all information relating to the function of the line passes through here. This man-machine interface allows for the supervision and control of the entire system.
A new centralised control room will be put in place, also including full supervision of stations and trains. Trials will be carried out at night, before commissioning, to check all system functions.

Essais des navettes et des systèmes

Real-time information

Automation allows for improved passenger information and service quality throughout the network. Platform edge doors on line 4 will be fitted with real-time information displays showing the precise waiting time for the next two trains.


Key to the following:
metro metro Next trains
Approaching - 0 min.
Following train - 3 min.


Additional information

View the map of line M4

Metro Line 4