RER Lines

RER stands for “Réseau Express Régional”, which translates to “Regional Express Network” in English. This mode of public transportation has the particularity of crossing the capital city on underground tracks only, unlike other train lines. It first appeared in the early 1970s, with the inauguration of the very first RER line: RER A, which is the busiest line in Europe1. There are a total of 5 RER lines: A, B, C, D, and E. These lines serve 249 stations, covering a total of 600 km of railway tracks. Every day, 2.7 million people commute on the RER lines in the Île-de-France region. Despite a 20% increase in ridership over the past 10 years, the RER network is regularly modernized, whether it's the trains for better comfort or the stations to make them accessible to all.

The RER allows more than 2 million daily commuters to travel between the outskirts of the Île-de-France region. All lines pass through one of the major Parisian train stations, except for line C, which passes through the Austerlitz station. To travel on the RER, use the Bonjour RATP! application. It provides real-time traffic updates and schedules for the next departures.