After a delayed procedure due to judiciary action taken by Alstom, the operators of line B of the Paris RER network, RATP, and SNCF, formally ordered 146 trains in April 2021. The “MI20” trains will be built by a consortium of Bombardier (now Alstom) and CAF.
A video has been released to explain the next step in the process: select your favorite design. People can vote for their favorite front end design and express which type of interior finish they prefer. It is the first time that we can actually show pictures of the design of the new RER B trains: