DR 720 to 722

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DR 720 to 722
Factory photo WUMAG DRG 720.jpg
Numbering: 720–722
DR 133 003–005
DB VT 79 900–902
DEBG VT 79 902
SWEG VT 5
VEFS Bocholt VT 5
Number: 3
Manufacturer: Waggon and mechanical engineering Görlitz
Year of construction (s): 1932
Retirement: 1990
Axis formula : A1
Length over buffers: 12,095 mm
Total wheelbase: 6,200 mm
Service mass: original: 13,000 kg empty
19,200 kg occupied (including standing room)
Top speed: 65 km / h
Installed capacity: 74 kW at 1,900 rpm
Driving wheel diameter: 900 mm
Impeller diameter: 900 mm
Motor type: Maybach OS 5
Motor type: 1 × 6 cylinder 4-stroke petrol engine
Power transmission: mechanical with the Mylius type
Tank capacity: 150 l
Seats: 36 + 7

The railcars DR 720 to 722 belong to the first series of lightweight railcars to be procured by the DRG . They were still manufactured with a gasoline engine and were the first type of railcar to be equipped with the Mylius gearbox , which was later very popular . One vehicle from the series is in the Darmstadt-Kranichstein Railway Museum .

history

Reichsbahn time

The railcars were ordered from Waggon- und Maschinenbau Görlitz (WUMAG) in 1931 and were the last vehicles to be equipped with a gasoline engine. For comparison purposes, two diesel railcars with electrical power transmission were ordered at the same time under the designation DR 805 and 806 , which were classified under the so-called heavy design .

The railcars can be seen as the ancestors of the modern two-axle railcars, the construction of which can be seen in the ČSD series M 131.1 , which was built up to 1956 : vehicle body in welded lightweight steel construction, machine system arranged under the floor under the passenger compartment, combined entry and control room where the operator had its place next to the entrance door and where the control room on the rear system was lockable. In order to be able to carry a two-axle sidecar, the vehicle was equipped with a pulling and buffing device of the lightweight design. Light sidecars with an empty weight of 9.1 t were also specially developed by WUMAG for the railcar.

DR 133 003-005

All three railcars were initially used in the Regensburg area. In the same year they were divided into the new name of the DR as DR 133 003-005 . The fact that they were equipped with a gasoline engine was fortunate that they continued to be used in civil service during the Second World War . Therefore, all three vehicles survived the world war. Two vehicles were then converted into sidecars.

VT 79 902

The DR 133 005 was initially retained and was designated as the VT 79 902 after 1945 . The car continued to be operated under this designation until 1953, after which it was retired and prepared for use by private railways.

Private railways

After it was taken out of service, the car was sold to the Deutsche Eisenbahn-Betriebsgesellschaft without an engine . There he received a diesel engine from Klöckner-Humboldt-Deutz with an output of 145 hp and was used on the DEBG routes until 1963. The historically valuable vehicle was then sold to the Südwestdeutsche Verkehrs-Aktiengesellschaft and ran there until 1987. The vehicle was often presented at major events. From 1987 to 1990 it belonged to the VEFS association in Bocholt . The vehicle has been in the Darmstadt-Kranichstein Railway Museum since 1990, where it was gutted and parked. In 2016, the association Eisenbahnfreunde Grenzland announced that it would transport the railcar to Walheim station near Aachen and refurbish it there for a museum operation on the Vennbahn and the Stolberg – Walheim railway line .

technical description

The vehicle has a 11,400 mm long steel underframe which carries the car body in lightweight steel construction. The box is clad outside with sheet steel and inside with wood. The car body is 3,055 mm wide in its greatest dimension, at the ends of the car the width is 2,370 mm. Behind the driver's cab 1 is a partition wall to the passenger compartment, which can be reached through a sliding door. The luggage compartment is located in the driver's cab 2 area. The toilet can be reached from the passenger compartment.

The manufacturing plant used the six-cylinder four-stroke gasoline engine with the designation OS 5 from Maybach-Motorenbau as the drive engine . With this engine, the maximum output was achieved at the high speed of 1,900 rpm. It weighed only 450 kg with a liter output of 14.3 HP / l (10.5 kW / l), this was the highest value for engines of the Deutsche Reichsbahn. The six cylinders had a bore of 94 mm and a stroke of 168 mm. The cylinder liners of the engine were lubricated with spray oil and the bearings of the crankshaft drive with pressurized oil from the crankshaft . If the lubricating oil pressure fell below 1.5 bar, a lamp in the driver's cab came on. The engine was battery -powered and started with a battery-powered starter. The fuel supply to the engine was regulated in the driver's cab by a cable and linkage.

For the first time, the pneumatically switched, synchronized preselector gearbox from Mylius was used as a mechanical power transmission. The configuration of this gearbox with the downstream pneumatically switched reversing gearbox was used for the first time on this vehicle.

The mileage of the motor of the railcars from 1932 to 1939 is known. Each car ran about 580,000 kilometers, which meant an average mileage of 77,300 km per year or 193,000 km per maintenance section. The average mileage without expansion was 75,000 km (the highest mileage was 153,000 km, the lowest less than 1,000 km). A replacement engine was available in the operations depot for exchange purposes .

literature

  • Heinz R. Kurz: The railcars of the Reichsbahn types . EK-Verlag, Freiburg 1988, ISBN 3-88255-803-2

Web links

Individual evidence

  1. ↑ Heinz Kurz: "The railcars of the Reichsbahn-Bauarten", EK-Verlag, Freiburg, ISBN 3-88255-803-2 , page 39
  2. ↑ Detailed information on the operation at DEBG
  3. ↑ Photo of the use of the railcar at the SWEG in front of the shed in Waldangelloch
  4. ↑ Photo of the railcar at the exhibition 150 Years of the German Railways
  5. ↑ Information board of the Eisenbahnfreunde Grenzland at the station festival 2016 in the museum station Walheim.
  6. ^ Heinz Kurz: "The railcars of the Reichsbahn-Bauarten", EK-Verlag, Freiburg, 1988, ISBN 3-88255-803-2 , page 40
  7. ↑ Heinz Kurz: "The railcars of the Reichsbahn-Bauarten", EK-Verlag, Freiburg, 1988, ISBN 3-88255-803-2 , page 41
  8. ↑ Heinz Kurz: "The railcars of the Reichsbahn-Bauarten", EK-Verlag, Freiburg, 1988, ISBN 3-88255-803-2 , page 42
  9. ^ Heinz Kurz: "The railcars of the Reichsbahn-Bauarten", EK-Verlag, Freiburg, 1988, ISBN 3-88255-803-2 , page 44