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RER E is one of the five lines in the Réseau Express Régional (English: Regional Express Network), a hybrid commuter rail and rapid transit system serving Paris and its suburbs. The 52.3-kilometre (32.5 mi) RER E line travels between Paris and eastern suburbs, with all trains serving the stations in central Paris, before branching out towards the ends of the line.
Originally referred to as the Est Ouest Liaison Express or EOLE (English: East West Express Link), RER E is the newest line in the system opening in 1999, with the extension in 2003, and further extensions to the west currently under construction (in 2024 to Nanterre-La Folie, in 2026 to Mantes-la-Jolie).[2]
RER E opened on 14 July 1999 between Haussmann – Saint-Lazare and Chelles–Gournay. The construction included a 2 km (1.2 mi) tunnel between Haussmann – St-Lazare and Magenta (which serves Gare de l'Est and Gare du Nord).
RER E is to be extended from Haussmann – Saint-Lazare to La Défense, from where it will take over the branch of RER A to Nanterre, Sartrouville and Poissy. It would then take over a section of SNCF tracks (currently carrying Transilien J) to reach Mantes-la-Jolie. Partial revenue service, from Haussmann - Saint-Lazare to Nanterre - La Folie, was expected to begin by the end of 2022, then full service in 2024,[4] but has since been delayed to 2024 and 2026, respectively.
An eight-kilometre (5.0 mi) tunnel will be dug between Haussmann–St-Lazare and La Défense. An intermediate station at Porte Maillot will offer a transfer to RER C. The extension is expected to reduce the load on central sections of RER B (between Gare du Nord and Châtelet) and RER A (between La Défense and Auber) by 10–15%. Additionally, transfers will be shifted away from current transfer hub Châtelet in the city center.[5]
Like all the other RER lines, each train is named after the route it takes. The first letter designates the destination, the second indicates whether the train will call at every station or not.
^"Map for journeys by wheelchair users"(PDF). Île-de-France Mobilités (in French and British English). Paris: Région Île-de-France. 11 May 2023. Archived from the original(PDF) on 13 July 2023. Retrieved 13 July 2023.
