Prussian EG 538 to EG 549

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Prussian EG 538 – EG 549
DR series E 91 3
EG 538 (factory photo SSW; 1915)
EG 538 (factory photo SSW; 1915)
Numbering: EG 538 - EG 549
DR E 91 38 - E 91 49
Number: 12
Manufacturer: SSW , LHW
Year of construction (s): 1915-1921
Retirement: until 1943
Axis formula : B + B + B
Gauge : 1435 mm ( standard gauge )
Length over buffers: 17,200 mm
Service mass: 101.7 t
Wheel set mass : 17.0 t
Top speed: 45 km / h
later 50 km / h
Hourly output : 1,025 kW
Continuous output : 835 kW
Starting tractive effort: 166 kN
Performance indicator: 10.1 kW / t
Driving wheel diameter: 1,350 mm
Power system : 15 kV 16 2/3 Hz ~
Power transmission: Overhead line
Number of traction motors: 3
Drive: Back gear with coupling rod drive

The EG 538 to EG 549 were electric locomotives of the Prussian State Railways for heavy freight train service . The German Reichsbahn gave the locomotives from 1925 the numbers E 91 38 to E 91 49 ( Series E 91 3 ).

history

Advertising brochure from Siemens (1915)

In July 1912 the Prussian State Railways ordered twenty heavy freight locomotives for the electrified lines of the KED Breslau . The electrical equipment was to be supplied by Maffei - Schwarzkopff -Werken (MSW) and Siemens-Schuckert-Werken (SSW). The order was later withdrawn from MSW. Therefore, only SSW supplied twelve electrical equipments. The mechanical part was built by the Linke-Hofmann-Werke in Breslau. The operating program envisaged the transport of 500 t freight trains on a 20 ‰ gradient and 1200 t freight trains on a 6 ‰ gradient at 20 km / h to 40 km / h.

Commissioning began in early 1915 and dragged on as a result of the First World War until 1921. In the designation scheme of the Prussian State Railways, they were given the numbers EG 538 to EG 549. The individual locomotive sections were also distinguished with the lowercase letters a, b and c.

The running characteristics of the locomotives could not be satisfactory. This was due to the three-part structure and engine vibrations. This often caused damage to the countersunk gears. Only the installation of large, spring-loaded gears improved the running characteristics, so that the speed of the locomotives could be increased to 50 km / h.

At the Deutsche Reichsbahn the vehicles were given the company numbers E 91 38 - E 91 49. Due to the still insufficient running characteristics, as well as increased requirements in freight train service, the machines began to be phased out of service from the mid-thirties. Some of the locomotives were converted into heating cars. The E 91 40 was the last locomotive of this series to be retired from the Deutsche Reichsbahn in 1943.

technical features

Mechanical part

Finished end frame of the locomotives with main transformer, traction motor and contactor frame on a factory photo from Siemens

The locomotives were built in three parts with the B + B + B wheel arrangement . Each undercarriage was driven individually via a gear train and coupling rods on each side. The central part of the locomotive body was equipped with two wood-clad driver's cabs and a luggage compartment. The vehicles thus belonged to the baggage car locomotives. The end frames were clad with sheet metal and made slightly narrower than the middle section of the locomotive.

The braking device consisted of a compressed air brake Kzbr, air compressor and main air reservoir as well as hand brakes .

Electrical part

The traction motors were AC series motors , one in each chassis. An oil-cooled transformer was housed in each end frame .

The primary windings of both transformers were arranged in parallel , while the secondary windings were connected in series with the traction motors. There was a main switch in the high-voltage chamber of each end frame . The control took place via electromagnetic contactors and triple choke coils . Fifteen continuous speed levels could be selected.

Web links

literature

  • Dieter Bäzold, Günther Fiebig: Railway vehicle archive. Part 4: Electric locomotive archive. 6th edition, Transpress Verlag, Berlin 1987; ISBN 3-344-00173-6
  • Glanert / Borbe / Richter Reichsbahn electric locomotives in Silesia VGB-Verlag 2015, ISBN 978-3-8375-1509-1 ,