In 2025, Saint Cloud will be one of the 11 stations of line 15 West of the Grand Paris Express. The station expects 85 000 passengers per day and currently has around 15 000. The new station is located next to the existing one and needs to be designed to accommodate new passengers in the best possible conditions.

In that context, EXPLAIN has been chosen to design the interchange and propose equipment to ensure good accessibility for non car users.