RER D
| RER D | |||
|---|---|---|---|
 
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| Overview | |||
| Stations | 59 | ||
| Ridership | 145,000,000 journeys per year | ||
| Operation | |||
| Opened | 1987 (last extension in 1996) |
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| Rolling stock | Z 5300, Z 5600, Z 20500 | ||
| Technical | |||
| Line length | 190 km (120 mi) | ||
| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) | ||
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The RER D is one of five RER rapid transit system lines serving Paris, France. It connects Orry-la-Ville and Creil in the north to Melun, Corbeil-Essonnes and Malesherbes in the south, passing through the heart of Paris.
Opened in stages from 1987 to 1996, it is the longest RER line by distance, and the busiest SNCF line in France, carrying up to 550,000 passengers and operating 440 trains each working day. Almost all of the line is located in the Île-de-France region, that is, within the jurisdiction of the Île-de-France Transport Union (STIF), but the some of the branch line ends at the north and south are outside this region. Due to a high rate of incidents and social issues, the line is sometimes colloquially known as the "RER poubelle" (trash line).
Line D also links Gare du Nord with Gare de Lyon via Châtelet – Les-Halles. The northern section of Gare du Nord opened in the late 1980s; a dedicated tunnel opened in 1995 to connect it to the SNCF network south of Gare de Lyon, part of which was transferred to the RER.
Initially, the "métro régional", the ancestor to the RER, was conceived of three lines, one going from east to west (the future RER A), a new line built from existing lines (the future RER C), the extension of the Ligne de Sceaux and with its interconnection with an SNCF line, along with a supplementary interconnected north-south (the future RER D). The operation of renovating "les Halles" gave the occasion to build Châtelet-Les Halles with a cut-and-cover method, in order to reduce costs.
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