In 1938, the Côtes du Nord (CdN) network, located in northern Britanny (Côtes d’Armor), was supplied with two modern railcars of the OC1 type, built by the De Dion Bouton company, and numbered 17 and 18. When the CdN closed in 1956, both units were transferred to the Réseau Breton (SNCF-RB), where they were put into service after having been overhauled by the RB works in Carhaix. They were re-numbered X157 and X158. When the Réseau Breton closed in 1967, X158 was transferred to the Baie de Somme and put back into service in early 1971. It provided commercial services on the Noyelles –St. Valery- Cayeux line until the end of 1972, before being transferred to Corsica. Meanwhile, X157 had been bought in 1969 by a preservation society (AJECTA) that was hoping to work tourist services on part of the recently closed line from Florac to Ste Cécile d’Andorge, in Lozère. This project having failed, the railcar was bought back by a CFBS member and transferred to the Somme in 1971 at the same time as its twin X158.  The owner of X 157 began restoring it, but the scope of work was such that the process was abandoned in the 1980s. Ownership was transferred to the CFBS in 1998 and it is hoped that this fine machine will be restored to working order in the future.

Some technical data:
- Weight empty: 19.5 metric tons.
- Wheel diameter: 0.65 m.
- Lenght:18.54 m.
- Width: 2.5 m.
- Height: 3.04 m.
- Motor: straight 8 cylinder 180hp Willème diesel
- Transmission: mechanical.
- Maximum speed in service: 50 Km/h
- 50 passengers seated.