RER D is one of the five lines in the Réseau Express Régional, a hybrid commuter rail and rapid transit system serving Paris and its suburbs. The 190-kilometre (120 mi) line crosses the region from north to south, with all trains serving a group of stations in central Paris, before branching out towards the ends of the line.
RER D train at Malesherbes station
Gare de Lyon underground station in June 2008.
A Z 20500 train at Corbeil-Essonnes station, in April 2007.
Protesters at Yerres on 17 October 2009
The Réseau Express Régional, commonly abbreviated RER, is a hybrid commuter rail and rapid transit system serving Paris and its suburbs. It acts as a combined city-center underground rail system and suburbs-to-city-center commuter rail. In the city center, it acts as a faster counterpart of the Paris Métro, having fewer stops.
RER C train at Villeneuve-le-Roi station
Z 20900 at Versailles Chantiers (RER C)
Z 57000 at Paris Gare de Lyon (Transilien Line R and RER D)
Z 50000 (RER E and Transilien Line P)