AREP is supporting SNCF with the western extension of the RER E line by designing the future La Défense station beneath the CNIT. The project involves integrating a major new station into one of Europe’s most complex multimodal hubs, connecting with metro line 1, RER A, SNCF services, the coach station and tram line T2.

From the earliest feasibility studies, AREP developed and compared several functional scenarios to optimise circulation, ensure clear connections, and integrate the station within a highly constrained underground environment. Particular attention was paid to avoiding existing structures, including the CNIT foundations, nearby high-rise buildings, car parks and retail areas, while ensuring the station remains fully accessible and efficient

Located more than 36 metres below ground, beneath the A14 motorway, the metro and RER A, the station includes one of France’s longest escalators, bridging a 25-metre height difference. AREP carried out the initial sizing of circulation areas (platforms, halls, access routes and exits), passenger flowanalyses, and the preliminary design for architectural, technical and non-structural components, enabling the civil engineering teams to calibrate the works.

AREP Group's mission:

Station design (subcontract)