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How does the RER connect Paris with its suburbs?
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Paris
View of the Paris skyline from Montparnasse.
The Réseau Express Régional (RER) is a high-speed express subway system that connects Paris with its surrounding suburbs through a network of cross-Paris routes.1
Unlike the standard Métro, which primarily serves the city center, the RER extends far into the suburban regions. The system is designed to facilitate efficient commuting, with lines that are occasionally integrated with the national main-line railway network. The central hub of this system is Châtelet–Les-Halles, which serves as a major interchange point for the network.21
Continued investment in the RER has focused on extending lines deeper into the suburbs and increasing capacity within central Paris to reduce road congestion and discourage daily automobile use.21