The line connects Creil in the north to Melun and Malesherbes in the south, passing through the heart of Paris.

[3] On 27 September 1987, the RER D was officially created, by extending existing suburban trains from Villiers-le-Bel to Gare du Nord, towards Châtelet-Les Halles.

On 22 November 2006 the STIF approved a master plan for the RER D in order to establish short, mid and long-term goals for its reliability.

Renovated trains feature a new blue livery, uniform 2+3 seats, new lighting and new floor covering.

The second letter indicates the stations served by the train in the section spanning from Gare de Lyon to Villeneuve-Saint-Georges.

Passengers aboard were invited to step off the train by the left, as track 2M has been neutralised by the regulators.

Ignoring the driver's orders, numerous passengers stepped off on the right, and were confronted with a northbound train, travelling at around 110 km/h (70 mph).

[15] This near miss, filmed by a passenger with a mobile phone, was broadcast the night of the incident, and created a large controversy.

[16][17] On 9 July 2004, an alleged anti-semitic assault provoked a public and political reaction, with immediate declarations from the Ministry of the Interior Dominique de Villepin and the President of France Jacques Chirac.