The French National Railway Company - SNCF
entrusts the Professional Organisation Committee for the Industry and Trade in Rail Transport Equipment with the task of finding the manufacturers for the new material.
In the case of the SEREM - CODER system, the best proposal comes from the CODER company and a contract is signed on July 9th, 1941, for 25x vans (with a payload of 8 t) and 25x tanks (with a capacity of 8.000 l and two equal compartments). The constructions is the responsibility of the CODER workshops located in Marseille in Saint-Marcel district.
The trailers ordered are primarily intended for road carriers who have agreed to abandon part of their long-distance services in favour of rail transport. During the war, thirteen companies signed agreements to this effect: in exchange for handing over a quota of goods to rail transport, they are guaranteed to receive a certain number of these new trailers (either the UFR system
or the SEREM - CODER system to choose from) in full ownership (the financing is covered for about 30% by the road companies and for 70% by the French National Railway Company - SNCF
) and the insurance of having the platforms and wagons necessary for their loading / unloading and their transport. Amendments are subsequently made to take into account possible obstacles to movement by rail and destruction of equipment attributable to acts of war.