De la Ligne de Sceaux au RER B : deux siècles d'histoire ferroviaire

Le Camulogène

Le Camulogène

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Read the full article on the Camulogène website: https://lecamulogene.fr/2026/05/12/li...

How did a small railway line, a modest experimental laboratory, become the RER B, one of the busiest lines in the Île-de-France region (and in Europe)?

Nearly a million passengers use it daily. Delays, incidents, overcrowding, RATP-SNCF interconnection: the RER B is now essential to the Parisian rail network, as well as infamous for its glaring operational difficulties. A look back at the inner workings of a line that has become a victim of its own success.

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