Trains to Montargis have a four-letter code beginning with G (GAMA, GAME, GAMO, GAMU, GOMO, GOMU), while those to Montereau have the first letter of the four always a K (KAMO, KOHO, KUMO).

The Syndicat des transports d'Île-de-France (STIF) decided to acquire them, during the Board of Directors meeting of December 11, 2013, so that they would completely renew the current fleet.

On the other hand, unlike the TER versions, the Transilien fleet will have no toilets, which has provoked strong reactions from regular users of the line.

The total investment amounts to more than 900 million euros, including the order for 43 Francilien trains for the H, K and L lines of the Transilien network.

The first 42 units were ordered in December 2014 at a cost of €397 million, with delivery of the first elements scheduled for September 2017 and full equipment of the line by the end of 2018