Acronym for Reseau Express Regionale, the RER is part of Paris' commuter rail system, falling between the regional commuter trains and the Metro. The RER is run jointly by the SNCF and RATP and has five lines, lettered A through E, and covers a large portion of the Ile-de-France:
- Line A runs roughly east-west between Disneyland Paris and the city's western banlieue;
- Line B runs northeast-southwest and connects Paris' two major airports, Charles de Gaulle Airport and Orly Airport;
- Line C spiders all over the region in eight different arms, following the Seine through Paris and going to the Chateau de Versailles, among other places;
- Line D runs north-south and is used primarily by commuters;
- Line E originates near the Opera Garnier and serves several eastern banlieue.
While Line C can be slow at times, the RER is generally the
fastest way to travel between distant points in
Paris. As an
added bonus, it is much les used by
tourists, since there are fewer
stops and the system is
deeper in the ground than the Metro; thus, there are fewer
crowds and
pickpockets than there are on the Metro. RER trains generally run at higher speeds than the Metro, as well.