In October 1931 the "Conseil Consultatif de l'Armement", under strong pressure by the Infantry to reach a quick decision, chose the Renault vehicle for production, even though the trial process hadn't been completed. On 9 December an order of fifty was made for the "Chenillette de ravitaillement d'Infanterie Modèle 1931 R". On 26 March 1932 a preseries of fifty tractor-carrying trailers was ordered, the first was delivered in June. Further orders followed, mass-production commencing in the second half of 1934. The series vehicles differed from the first in having a towing sign plate fitted on the top, new towing hooks and an elongated stowage box on the left side. Orders reached a total of 793 on 1 January 1936 and of about 1,200 by June 1936 — 700 of which had been delivered by June 1936, 920 by October 1936, 976 on 1 January 1937. In December 1936 the military branch of Renault was nationalised as the AMX company which continued production to a total of about 2,200, later joined by Berliet which would build another 100 and Fouga which would produce 300 for a grand total for the "Modèle 31" of about 2600.