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DB Class E 40 - Wikipedia, the free encyclopedia

DB Class E 40

From Wikipedia, the free encyclopedia

Deutche Bundesbahn E 40
Deutche Bundesbahn E 40
140 388-0 at Unkel on 2005-05-25
Power type {{{powertype}}}
Builder Krupp, Henschel, Krauss-Maffei, Siemens, AEG, BBC
Build date 1957–1973 (E40.11/139: 1959,1965)
Total production 879
UIC classification Bo'Bo'
Gauge 1,435 mm (4 ft 8½ in)
Length 16.49 m (54 ft 1 in)
Locomotive weight 83 tonnes (82 LT/91 ST)
Traction motors Four
Top speed 100 km/h (110 km/h)
Power output 3,700 kW (5,000 hp)
Tractive effort 275 kN (62,000 lbf)
Locomotive brakes K-GP mZ, electric brakes (Class 139 only)
Train brakes Air
Safety systems Sifa, PZB
Career Deutsche Bundesbahn
Deutsche Bahn AG
Class E40 / E40.11 (from 1968: 140 / 139)

The Baureihe E 40 is a German Einheits-Elektrolokomotive commissioned by the Deutsche Bundesbahn in 1955, designed for freight trains. Since the 1968 renumbering, it is listed as Class 140 and Class 139.

[edit] Development

In 1950, the Deutsche Bundesbahn decided to introduce two general types of electric locomotives with standardised components: A twelve wheel (UIC: C'C') freight train locomotive based on the class E 94 and an eight wheel (UIC: B'B') general purpose electric locomotive based on the class E 44. As a new feature the engineers should be seated, whereas formerly they had to stand.

In due course of the construction the to speed requirement for the general purpose locomotive (working title E 46, then changed to class E 10) was increased to that point that the layout was one for an express train locomotive. Two types were not found sufficient to cover all needs, so the Einheits-Elektrolokomotiven program was changed to four general types: Light passenger train locomotive (class E 41), express train locomotive (class E 10), freight train locomotive class E 40 and heavy freight train locomotive (class E 50). All four classes should share a maximum of standard components.

[edit] Production of class E 40 and technical layout

The class E 40 basically is a class E 10 without electric brake, changed gearbox for lower speed respectively higher traction and additional minor changes. At 879 units built, it is the Einheitslokomotive with the most units of its type constructed. Its original speed was 100 km/h, this was enhanced to 110 km/h in 1969 in order to allow better usability also for commuter trains. The last series, colloquially known as 140.8, was equipped for push-pull train operation.

As all other types of the Einheitslokomotiven program the class E 40 had welded bogies with central pins. Instead the formerly used cannon box engines it used a quill drive with a circular rubber spring as a connecting element ("Gummiringfeder" in German) allowing for a smooth power translation. The control unit comprised 28 possible power settings.

In 1968 class E 40 was renumbered to class 140.

[edit] Subclass E 40.11

Starting in 1959, 31 locomotives were equipped with electrical brakes (as all class E 10 units were) for the ramp near Erkrath-Hochdahl between Düsseldorf and Wuppertal and the Höllentalbahn in southern Germany. Nowadays these engines are in service around Munich, with recent services to Austria, where the electric brake is very useful. In the beginning of the 1990s some additional class 139 (as they were renumbered in 1968) were built by equipping class 110 units with class 140 bogies and gearboxes from class 110 units pulled out of service.

Both class 140 and class 139 are being replaced by newer constructions such as class 145, class 185 and class 189. It is widely expected that the last units will be scrapped before 2010, though the higher than expected increase in railway freight traffic has created some traction shortages, thus some class 140 units are being overhauled.

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