Paris Métro Line 18

Paris Métro Line 18 is one of four new lines of Grand Paris Express, a major expansion project of the Paris Métro. Currently under construction, it will link Orly Airport to Versailles via Massy – Palaiseau, the Saclay plateau and Saint-Quentin-en-Yvelines. The line will be 35 kilometers (22 mi) long, and will be fully automated (along with all Grand Paris Express lines). Subsequently, it is planned to be extended by about 15 kilometers (9.3 mi) from Versailles to Nanterre via Rueil-Malmaison.

Line 18
Overview
TerminiVersailles-Chantiers
Orly Airport
Connecting lines


Stations12
Service
SystemParis Métro
Operator(s)RATP
History
Planned opening2026 (from Massy-Palaiseau to CEA Saint-Aubin)
2027 (from Orly Airport to Massy-Palaiseau)
2030 (from CEA Saint-Aubin to Versailles-Chantiers)
after 2030 (from Versailles-Chantiers to Nanterre-La Folie)
Technical
Line length50 km (31 mi)
Track gauge1,435 mm (4 ft 8+12 in) standard gauge
Conduction systemAutomated
Route map

Nanterre-La Folie
Rueil
proposed
Versailles – Chantiers
Satory
Saint-Quentin Université
Saint-Quentin Est
CEA Saint-Aubin
Orsay Gif
Palaiseau
Massy – Palaiseau
Massy-Opéra
Antonypole
Aéroport d'Orly

It is expected to be completed after 2030. Its first section, from Orly airport to the Saclay plateau (CEA Saint-Aubin), is scheduled to open in 2026 between the stations of Massy-Palaiseau and CEA Saint-Aubin, and in 2027 between Massy-Palaiseau and Orly airport. One of the line's aims is to serve the technological and scientific development cluster of Paris-Saclay and the campus of Paris-Saclay University.

Project management for engineering and stations has been entrusted to the Icare group, led by Ingérop Consulting and Engineering, with several architectural firms for the various stations of the section while the systems are under the responsibility by Egis Rail. The viaduct and the overhead stations are entrusted to the Benthem Crouwel group.

It will be the only metro line of the Grand Paris Express that will serve the department of Yvelines with three stations in two municipalities: the station of Versailles-Chantiers and that of Satory will be located at Versailles and the Saint-Quentin Est station will be located at Guyancourt.

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