| The Baureihe E 40 is a German standard electric locomotive commissioned by the Deutsche Bundesbahn in 1955, designed for freight trains. 879 units were built. The class 139 are a class E 40 sub variant with stronger electric brakes for freight work on steeper grades. In the beginning of the 1990s some additional class 139 (as they were renumbered in 1968 from class E 40.11) were built by equipping class 110 units with class 140 bogies and gearboxes from class 110 units pulled out of service to beef up the fleet of heavy used class 139 demand. |