In 2012, STIF identified the need to expand capacity on Line 14, due to the planned simultaneous extensions north to Saint-Denis–Pleyel and south to Aéroport d'Orly.
Therefore, the STIF deemed it urgent to extend the train-sets from six to eight cars, something that was not fully realised on the Metro prior to the construction of Line 14 (all of the existing stations on the line are capable of handling eight-car train formations).
In January 2015, RATP awarded the framework contract for the MP 14 trains to Alstom at an overall cost of €2 billion.
[4] Since that date approximately, 2 trains have been delivered per month by Alstom, where they remain for 2 weeks in final tests, then are introduced into passenger service on the line.
The trains are loaded with ballast, to simulate the presence of passengers, and have thus circulated at different speeds to check the good behavior of the viaduct.
On the manually-driven MP 14's on Line 11, the end window was replaced with a cabin access door.
Inside the train, the predominant colour is white with gray-beige at lower levels.
Passenger information is provided by AVSA (Annonces Visuelles et Sonores Automatiques), with an illuminated line plan above the doors, as well as audible announcements.
There are also LCD screens which display the next stop, connections, the destination of the train, the geographic route of the line and — when approaching the station — the plan of the platforms and exits in relation to its position in the train, similar to displays in Japan.
Trains are equipped with full air conditioning to maintain a pleasant temperature, and therefore the windows cannot be opened.
[4] The power control system is an OniX 572 type inverter using IGBT components manufactured by Alstom.
The extension to Bagneux–Lucie Aubrac was opened in 2022,[20] and, as of March 2022, the automation of the line is set to be completed by the end of 2023.
As of 04 December 2024, 33 5-car sets are allocated to Rosny depot for use on Line 11. uses driverless trains in an 8-car formation, MP14–8 (5M3T).