 On the formation of the SNCF in 1938, the Est locomotives became 1-140.C.to 1-140.C.35; the État locomotives became 3-140.C.101 to 3-140.C.370; and the PLM locomotives 5-140.K.1 to 5-140.K.35.After World War II, the locomotives were concentrated in the Eastern Region, and while the ex-État locomotives only needed their region prefix changed from "3" to "1", the ex-PLM locomotives were renumbered to 1-140.C.36 to 1-140.C.70.The 140.Cs were allocated to all the main État depots, Mézidon, Le Mans, Rennes, Brest, Nantes and Bordeaux, and were used to haul many of the company's express trains; Paris-Le Havre, Paris-Cherbourg, Paris-Granville and on the Chemin de fer de Grande Ceinture.