RER C 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 186-kilometre (116 mi) line crosses the region from north to south. Briefly, between September 1979 and May 1980, the line was known as the Transversal Rive Gauche. The line is operated by SNCF.
RER C train crossing the Pont Rouelle, with the Eiffel Tower in the background, as seen from Île aux Cygnes
RER B is one of the five lines in the Réseau Express Régional, a hybrid commuter rail and rapid transit system serving Paris, France and its Île-de-France suburbs. The 80-kilometre (50 mi) RER B 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 B train at Charles de Gaulle Airport station