Summer works at public transportation francilien – RER A / RER C
This summer, the RER A track replacement work will lead to a total closure of the RER A line between La Défense and Nation from July 29, to August 27 inclusive.
Therefore La Défense and Nation will become temporary terminus (stations will remain open and connections will be operated), whereas RER A train platforms will be entirely closed at Charles-de- Gaulle-Etoile station, Auber station, Châtelet-les- Halles station and Gare de Lyon station
Source : http://www.ratp.fr/node/3041
Beacuse of the summer works, RER C line will be closed between Paris Austerlitz and Javel, Paris Austerlitz and Avenue Henri Martin from July 15th to August 26th insclusive.
During this period, SNCF and RATP help passengers in :
· Strengthening Line 10 that along Line C,
· Strengthening bus 63 that reach to Avenue Henri Martin station from Paris Austerlitz,
· Setting up a special shuttle beteween Invalides and Javel that permit to reach the touristic places, normally Line C has served.
Source : https://malignec.transilien.com/wp-content/uploads/2017/01/livret-IHP2017_20170116_WEB.pdf