Network modernisation

RER line B: 2023 works

Works have been planned on RER line B 30 September 2023. Details below.

On Saturday, September 30, 2023, works on the RER C, involving work on the RER B line, will result in the suspension of RER B services in both directions throughout the day between Fontaine-Michalon and Massy–Palaiseau stations.

Replacement buses will operate in both directions between Fontaine-Michalon and Massy–Palaiseau stations. You can refer to the replacement plan below:

RER B

We recommend planning for an extended travel time.

Stay informed:

In the meantime, you can consult this dedicated page, which will be regularly updated, as well as the RER B blog and the twitter account Twitter @RERB.

Modernisation