Editing Truck (section)

===Diesel engines===
[[File:Foden_Diesel_Truck_(40746179963).jpg|thumb|[[Foden Trucks|Foden]] diesel truck from 1931]]

Although it had been invented in 1897, the [[diesel engine]] did not appear in production trucks until Benz introduced it in 1923.<ref>{{cite web|title=Debut of diesel engines in tractors and trucks|url=https://media.daimler.com/marsMediaSite/en/instance/ko/Debut-of-diesel-engines-in-tractors-and-trucks.xhtml?oid=9361501|publisher=Daimler AG|access-date=27 September 2018|archive-date=27 September 2018|archive-url=https://web.archive.org/web/20180927173954/https://media.daimler.com/marsMediaSite/en/instance/ko/Debut-of-diesel-engines-in-tractors-and-trucks.xhtml?oid=9361501|url-status=live}}</ref> The diesel engine was not common in trucks in Europe until the 1930s. In the United States, Autocar introduced diesel engines for heavy applications in the mid-1930s. Demand was high enough that Autocar launched the "DC" model (diesel conventional) in 1939. However, it took much longer for diesel engines to be broadly accepted in the US: gasoline engines were still in use on heavy trucks in the 1970s.<ref>{{cite book|last=Davies|first=Peter J.|title=The World Encyclopedia of Trucks|year=2000|publisher=Lorenz Books|isbn=0-7548-0518-2|pages=20–21, 114, 118, 160, 204}}</ref><ref>{{cite book|title=Motor's Truck and Diesel Repair Manual|edition=26|year=1973|publisher=Motor|isbn=0-910992-16-9|pages=530, 1035}}</ref>