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The RER E (originally referred to as the EOLE, or Est Ouest Liaison Express) is one of the five lines in the RER rapid transit system serving Paris, France. The line runs from the western terminus Haussmann St-Lazare (E1) to the eastern terminuses Chelles-Gournay (E2) and Tournan (E4). It is operated by SNCF.
RER E opened on 12 July 1999 between Haussmann – St-Lazare and Chelles-Gournay. The construction included a 2 km tunnel between Haussmann – St-Lazare and Magenta (which serves Gare de l'Est and Gare du Nord).
The line was first extended with a new branch from Noisy le Sec to Villiers-sur-Marne on 30 August 1999. This branch was extended to Tournan on 14 December 2003.
RER E is to be extended from Haussmann – St-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 to reach Mantes-la-Jolie. Partial revenue service is expected to begin in 2018, full service in 2020.
An eight kilometre 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.