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
TU10 diesel locomotive TU10 diesel locomotive The locomotives TU10 (Russian TУ10) of the Russian Railways (RŽD) are narrow gauge diesel locomotives for children's railways. The children's railways or pioneer railways were used for extracurricular education, where adolescents learned railway professions. This phenomenon originated in the USSR and was greatly developed in Soviet times. However, existing children's railways continued to be used, and new tracks and locomotives were built even after the break-down of the Soviet Union. Most of these railways operate diesel engines, but some of them occasionally fire up old steam locomotives. Some TU2 diesel locomotives from the 1950s are still being