Diesel locomotive were classified as DET 1 and DET 2 (). Due to shortage of petrol products during World War I, they remained unused for regular service in Germany. In 1922, they were sold to Swiss Compagnie du Chemin de fer Régional du Val-de-Travers (), where they were used in regular service up to the electrification of the line in 1944. Afterwards, the company kept them in service as boosters till 1965. Fiat claims a first Italian diesel–electric locomotive built in 1922, but little detail is available. A Fiat-TIBB diesel–locomotive "A", of 440CV, is reported to have entered service on the Ferrovie
Baldwin Locomotive Works which boosted demand for their coal-fired steam locomotives while acquisition of EMD's Diesel locomotives was in its most restricted period. In 1943 Baldwin launched its belated road Diesel program, producing a prototype "Centipede" locomotive which was later rebuilt to introduce their first major product in the postwar market. During World War II Baldwin's contributions to the war effort included not only locomotives and switchers but also tanks. Baldwin was one of the manufacturers of several variants of the M3 tank (M3 Lee, M3A2, M3A3, M3A5) and later the M4 Sherman. A Baldwin subsidiary, the Whitcomb Locomotive Company, produced hundreds of