A concrete, 199-metre viaduct was built in spring 1968. Aesthetically designed to integrate with the landscape, it has six supports (including one of its three piers in the river. The two central spans are 55.5 metres long, and the two side spans 30 metres long. The structural steel is a continuous metal beam, supported by two vertical beams. These beams frame the bottom of the trains, and the rails are laid on track ballast, for noise reduction. On the north, the viaduct overhangs the A4 autoroute before going underground on a 100-metre access ramp. On the south, the line immediately goes underground on a 70-metre ramp. The viaduct has a continuous slope of 40 mm/m, enabling it to go underground when it crosses the left bank of the Marne. In June 1969 the metal beams were put in place, and the structure was completed in November.