RER is a network of lines serving both Paris and the suburbs. Working the same way as the Subway; it is divided into 5 lines (A; B; C; D; E); each one being subdivided into several forks (A1 to A5 for example). The Subway tickets are valid for Paris and inner suburbs use.

For outer suburbs; different rates apply; depending on how far from Paris your destination is. Within Paris; RER communicates with the Subway Network. It's usually faster to take the RER than the subway. Parisian airports; numerous suburban cities and some attraction areas outside Paris are served by the RER : Roissy Charles de Gaulle Aiport (Line B3); Orly Airport (lines B4 and C2); Eurodisney (line A4) and Versailes (Line C5); ...

See RER Map for more detailed information.