Their construction was tailored to the economic circumstances of wartime Germany along with conquered and occupied territories across Europe, taking account of the shortage of materials, the transportation of goods in support of military logistics, ease of maintenance under difficult conditions, resistance to extreme weather, limited life and the need for rapid, cheap mass production.
In order to meet these requirements, economic drawbacks such as relatively high fuel consumption had to be accepted.
[2] Oberschlesische Lokfabrik Krenau took over Polish manufacturer Fablok and used forced labour under threat of death.
[2] Identical engines were produced in Vienna, Kassel, Berlin, Munich, Stuttgart, Kirchen, Plzeň (Pilsen), and Strasbourg.
German electric locomotives were given aluminium windings in the traction motors and transformers, and the steam engines had steel fireboxes, hence the name Heimstofflok or 'home-grown loco'.