DRG Class E 77

The German DRG Class E 77 was a Deutsche Reichsbahn-Gesellschaft electric locomotive class, which was ordered in 1923 and entered service in 1924. The 56 units of this class were specifically intended for the Halle (Saale) - Leipzig line and for routes in southern Germany.

Bavarian Class EG 3
Prussian Class EG 3
DRG Class E 77
Museumslok E 77 10
Number(s)01–31
51–75
Quantity56
ManufacturerBMAG, BMS, Krauss, LHW
Year(s) of manufacture1924–1926
Retired1968
Axle arrangementinitially (1B)(B1), later (1′B)(B1′)
Track gauge1,435 mm (4 ft 8 1⁄2 in)
Length over buffers16,250 mm (53 ft 3.8 in)
Service weight113.0 t (111.2 long tons; 124.6 short tons)
Top speed65 km/h (40 mph)
Power output (one hour)1,880 kW (2,520 hp)
Power output (continuous)1,600 kW (2,100 hp)
Starting tractive effort235 kN (53,000 lbf)
Power index16.6 kW/t
Electric system15 kV  ​16 2⁄3 Hz AC Catenary
Collection methodPantograph
No. of traction motors2
TransmissionWinterthur Schrägstangenantrieb
Running step switchElectro-pneumatic Schützensteuerung mit Stromteilern
BrakesCompressed-air brake

Pre-war period

The E 77 had been designated a light multi-purpose locomotive within DRG's first classification programme. Later it was mainly used on freight trains.

The engines were delivered by BMAG, Krauss and LHW and had originally still held the State Railways' Class EG 3 title with numbers 22 001 through 031 (Bavarian) or EG 701 to 725 (Prussian). BMS delivered the electrical parts.

In service, the E 77 distinguished itself with a rather limited result. One was never really satisfied with its running abilities. Moreover, there were often problems due to the many flexible electric cables. During World War II all engines ended at the Reichsbahndirektionen Halle und Hanover in exchange for Class E 75.

Post-war period

At the end of the war, 53 locomotives were left. 42 thereof, as well as parts of engines E 77 02, 09, 19, 28, 56, 67, 71 and 73, which had been taken out of service due to damages, were ceded to the Soviet Union as reparations. E 77 06 and 51 were so heavily damaged that their scrapping in Leipzig was authorized in 1947/48. Nothing is known of E 77 64's post-war fate. In 1952/53, 38 of the reparations locomotives (not E 77 05, 58 and 75) were returned into DR's stock. Of them, only 10 units with numbers E 77 03, 10, 14, 15, 18, 24, 25, 30, 52 and 53 were repaired past 1955. The others were scrapped only in the 1960s. When sufficient numbers of new electric locomotives were available, Class E 77 was retired and save for E 77 10, all units were scrapped as well until late in 1966. For a few years, E 77 10 still served as a switch heating engine at Halle central station and was then converted to a heritage locomotive at the Dresden railway works, whereby it was almost restored to its prior state.

Technical data

Save for the first series of Prussian locomotives (EG 701 - 713, later E 77 51 to 77 63), all engines had originally had cowl doors. At the reinstatement by DR though, those were dropped. The trailer axles of the threepartite linked locomotives were at first embedded steeply and later flexibly, so that the wheel arrangement was changed from (1B)(B1) to (1'B)(B1'). But even after this conversion they were not yet satisfied with the engines' smoothness.

The work schedule featured the following transportation services:

  • Freight trains with 1,800 tonnes at a 3 permille slope with 30 km/h
  • Passenger trains with 500 t at 3 permille with 60 km/h
  • Passenger trains with 500 t at 10 permille with 50 km/h and
  • Freight trains with 850 t at 10 permille with 25 km/h.

The locomotives had 15 permanent running steps.

Preserved locomotives

Of the 56 exemplaries built in total, one unit has been preserved. E 77 10 is nowadays based at the Dresden Transport Museum.

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See also

Literature
  • Obermayer, Horst J. (1970). Taschenbuch Deutsche Elektrolokomotiven (in German). Stuttgart: Franckh'sche Verlagshandlung. ISBN 3-440-03754-1.
  • Bäzold; Fiebig (1984). Eisenbahn-Fahrzeug-Archiv 4, Elektrische Lokomotiven deutscher Eisenbahnen (in German). Düsseldorf and Berlin: Alba- Verlag and Transpress Verlak. ISBN 3-87094-106-5.
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