RER A
The RATP trains for the RER A would be called the MI 2N "Altéo", while the SNCF trains for the RER E would be called the Class Z 22500, also known as the MI 2N "Eole" (EOLE was the name of the RER E during construction). The two trains look very similar from the outside, but the "Altéo" trains for the RER A would feature three motors per trainset for faster acceleration, while the "Eole" trains would only have two motors, and would eliminate the stairs between the upper deck and the center vestibule in favor of having 22 additional seats per train.