Derived from the previous X 2720 and X 2770 series (RGP 1), characterized by unique diesel traction, the X 2700, also called RGP 2, was equipped with two Renault type 517-V12 engines capable of releasing 300 horsepower and could reach a top speed of 124 km/h. The 20 units commissioned by the SNCF, on a project of the Office national de la recherche ferroviaire, were built from 1954 and remained in service until the 1990s. The X 2700s featured a two-unit package, one of which was motorized, and had its trailer which was defined XR 7700, they were used for long and medium journeys, even across borders and sometimes even as far as Geneva.