When the "Réseau des Bains de Mer" closed to commercial services, the CFBS preserved several types of former S.E. box vans that were used for carrying goods on the Somme network, 11 in total. They carried parcels and produce requiring protection from the elements, as well as livestock. In 2018, 3 of them were «deconstructed» in view of their parlous condition. Whatever parts could be salvaged were placed in storage.
In 1978, one Swiss box van and 5 from the Réseau Breton (RB) network were delivered to the CFBS. Two RB wagons were sold to another preservation society in 2019.

Previously: SE Somme 
K 11008: Built by La construction Manage (Belgium) in 1921: dismantled in 2018.
K 11013: Built by La construction Manage (Belgium) in 1921: restored in 2009.
K 11025: Built by La construction Manage (Belgium) in 1921: dismantled in 2018.
Kf 12005: Built by La construction Manage (Belgium) in 1921: dismantled in 2018.
K 1219: Built by Baume & Marpent (Nord) between 1890/1910 : preserved, to be restored
K 1247: Built by Baume & Marpent (Nord) between 1890/1910: preserved, to be restored
K 1254: Built by Baume & Marpent (Nord) between 1890/1910: preserved to be restored
Listed as a Heritage Item
K 1276: Built by Baume & Marpent (Nord) bteween 1890/1910: preserved, to be restored
Kf 2222: Built by Baume & Marpent (Nord) between 1890/1910 : restored, in  service.
Kf 2224: Built by Baume & Marpent (Nord) between 1890/1910: preserved, to be restored
Kf 2246: Built by Baume & Marpent (Nord) between 1890/1910: preserved, to be restored

Note: the figure 1 before the registration number designates the wagons remplaced in 1920 following war damage. «f»: designates a wagon fitted with brakes.
Previously: Réseau Breton (Ouest/Etat/SNCF-SE) 
K 584: Builder unknown (Ouest) ca. 1900: preserved, to be restored
Kf 1501: Builder unknown (Ouest) ca. 1900: preserved, to be restored
Listed as a Heritage Item
Kf 1590: Builder unknown (Ouest) ca. 1900: restored in 2018, in service.

Previously: Chemins de fer électriques de la Gruyère (Switzerland) 
Kf 603: Built by Schlieren, in 1903: restored, in service. Used as a luggage van