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ÖBB Class 4020
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ÖBB Class 4020
The ÖBB class 4020 of the Austrian Federal Railways (ÖBB) are electric multiple units (EMU) developed by Simmering-Graz-Pauker (SGP). In the narrower sense, 4020 is the designation of the railcars, the control cars are referred to as series 6020 and the intermediate cars as series 7020. They are the second generation of Vienna S-Bahn trains and were also used throughout Austria in regional transport. Operation in scheduled services began in October 1978, the sets were manufactured by Simmering-Graz-Pauker in Graz.
In the mid-1970s, ÖBB decided to procure new vehicles for local transport in metropolitan areas, in particular for the Vienna rapid transport system. After several test runs with EMUs from other railways (including the DB 420 series), ÖBB ordered a total of 120 three-car sets of the 4020 series from SGP in several series for use on the Vienna express line and for regional transport in conurbations such as the Tyrol-Inn Valley and the greater Linz area. The design of the 4020 series was based on the concept of the older 4030 series, but otherwise broke completely new ground: the 4020 series railcars were equipped with thyristor control and mixed-current motors, powerful electric resistance brakes and cradle less bogies with air suspension. As was customary at the time, the electrical equipment was supplied by the BES consortium, consisting of the companies Brown-Boveri, ELIN, and Siemens under the leadership of Siemens. The electrical company responsible for the electrical commissioning was indicated on the factory plate of each vehicle. Johann Benda, who had previously designed the 4010 series railcar trains, was also responsible for the design of these vehicles.
After the first test runs in October 1978, the railcars were used for the first time in scheduled service on the later S80 line from December 1978. After test runs in Tyrol, they were used for the first time on the main line from spring 1979, primarily in the direction of Stockerau.
After commissioning the first series (4020.01-40), it became apparent that the rotary compressors adopted from the 4030 series were not sufficient to supply compressed air to the very high-consumption air suspension, which is why screw compressors were used from unit 4020.41 onwards. However, the problems with the compressed air supply could only be permanently eliminated with the use of heavy piston compressors from unit 4020.81 onwards. Later, all rotary compressors were replaced by piston compressors.
With the reopening of the Suburban line in 1987, railcars 4020 095 to 100 were equipped with a door area monitoring system with light barriers for unaccompanied operation.
Railcar 4020 006, which was involved in an accident in Süßenbrunn in 1991, was the first railcar to undergo a main overhaul, during which some of the modifications from the main overhaul carried out from 1993 onwards were tested. Due to the absence of the other two 4020 series vehicles involved in the accident during the long overhaul, one of the two accident sets, 4020 056, was also used as a two-car set in the following months. This ran on the S80 line or as a regional train between Gramatneusiedl and Wampersdorf.
In the years from 1993, all railcars underwent a major overhaul, which was recognisable both technically and externally by the change of paintwork. However, some of the work had already been carried out on all railcars without the main refurbishment.
From 2002, the railcars that had already been rebuilt at this time were fitted with an emergency brake override (EBO), while the others received them during the subsequent main upgrade.
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ÖBB Class 4020 AI simulator
(@ÖBB Class 4020_simulator)
ÖBB Class 4020
The ÖBB class 4020 of the Austrian Federal Railways (ÖBB) are electric multiple units (EMU) developed by Simmering-Graz-Pauker (SGP). In the narrower sense, 4020 is the designation of the railcars, the control cars are referred to as series 6020 and the intermediate cars as series 7020. They are the second generation of Vienna S-Bahn trains and were also used throughout Austria in regional transport. Operation in scheduled services began in October 1978, the sets were manufactured by Simmering-Graz-Pauker in Graz.
In the mid-1970s, ÖBB decided to procure new vehicles for local transport in metropolitan areas, in particular for the Vienna rapid transport system. After several test runs with EMUs from other railways (including the DB 420 series), ÖBB ordered a total of 120 three-car sets of the 4020 series from SGP in several series for use on the Vienna express line and for regional transport in conurbations such as the Tyrol-Inn Valley and the greater Linz area. The design of the 4020 series was based on the concept of the older 4030 series, but otherwise broke completely new ground: the 4020 series railcars were equipped with thyristor control and mixed-current motors, powerful electric resistance brakes and cradle less bogies with air suspension. As was customary at the time, the electrical equipment was supplied by the BES consortium, consisting of the companies Brown-Boveri, ELIN, and Siemens under the leadership of Siemens. The electrical company responsible for the electrical commissioning was indicated on the factory plate of each vehicle. Johann Benda, who had previously designed the 4010 series railcar trains, was also responsible for the design of these vehicles.
After the first test runs in October 1978, the railcars were used for the first time in scheduled service on the later S80 line from December 1978. After test runs in Tyrol, they were used for the first time on the main line from spring 1979, primarily in the direction of Stockerau.
After commissioning the first series (4020.01-40), it became apparent that the rotary compressors adopted from the 4030 series were not sufficient to supply compressed air to the very high-consumption air suspension, which is why screw compressors were used from unit 4020.41 onwards. However, the problems with the compressed air supply could only be permanently eliminated with the use of heavy piston compressors from unit 4020.81 onwards. Later, all rotary compressors were replaced by piston compressors.
With the reopening of the Suburban line in 1987, railcars 4020 095 to 100 were equipped with a door area monitoring system with light barriers for unaccompanied operation.
Railcar 4020 006, which was involved in an accident in Süßenbrunn in 1991, was the first railcar to undergo a main overhaul, during which some of the modifications from the main overhaul carried out from 1993 onwards were tested. Due to the absence of the other two 4020 series vehicles involved in the accident during the long overhaul, one of the two accident sets, 4020 056, was also used as a two-car set in the following months. This ran on the S80 line or as a regional train between Gramatneusiedl and Wampersdorf.
In the years from 1993, all railcars underwent a major overhaul, which was recognisable both technically and externally by the change of paintwork. However, some of the work had already been carried out on all railcars without the main refurbishment.
From 2002, the railcars that had already been rebuilt at this time were fitted with an emergency brake override (EBO), while the others received them during the subsequent main upgrade.
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