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RER B

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The RER B is a 80-kilometre railway line in the Paris region, connecting the north and south suburbs to central Paris. It opened in stages between 1977 and 1978, and has had a significant impact on the region, carrying 165 million passengers per year in 2004. The line is operated by 148 sets of MI 79 and MI 84 trains, and will be replaced by the MI 20 series from 2025. Future plans include the creation of a new infill station called "Aérofret" and the extension of the line northeast from Mitry–Claye station to the Dammartin-en-Goële area. The RER B line is the second busiest single rail line in Europe, after RER A.learn more on wikipedia

RER B