The X73500 is a diesel multiple unit (DMU) train type operated by SNCF.

The trains are single unit railcars.

X73813 - X73818 are former CFL (Luxembourg) units 2101 - 2106 and operate in the Alsace region.

The SNCF Class X 73900 is an identical version of the X 73500, but can also operate into Germany.

The units are used on rural, unelectrified railway lines in France and are operated by all TER regions except Île-de-France, Corsica and Provence-Alpes-Côte d'Azur.