The RATP informs us, following a delay in the works due to an accident in Massy on July 25th :
– RER B interrupted between Baconnets and St Rémy-lès-Chevreuse until August 20th included.
– RER service between Baconnets and Massy will be interrupted until August 27 (traffic will resume between Massy and St Rémy-lès-Chevreuse on August 21) RATP is doing its utmost to allow traffic to resume between Les Baconnets and Massy-Palaiseau from August 28. This information will be updated regularly.