HHA type DT4
| Hamburger Hochbahn AG type DT4 |
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| Numbering: | DT4.1: 101 - 130 DT4.2: 131 - 151 DT4.3: 152 - 171 DT4.4: 172 - 186 DT4.5: 187 - 209 DT4.6: 210 - 226 |
| Number: | 126 double railcars |
| Manufacturer: | Bombardier , LHB |
| Year of construction (s): | 1988-2005 |
| Axis formula : | Bo'2'Bo '+ Bo'2'Bo' |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over coupling: | 60,280 mm |
| Height: | 3,370 mm |
| Width: | 2,580 mm |
| Empty mass: | 76.9 t |
| Top speed: | 80 km / h |
| Hourly output : | 8 × 125 kW = 1000 kW |
| Power system : | 750 V DC |
| Power transmission: | Lateral power rail coated from below |
| Seats: | 182 |
| Standing room: | 223 |
The double multiple units 4 ( DT4 ) are rail vehicles that are used in the Hamburg subway network . They travel as planned on the U1 , U2 and unscheduled lines or, in the case of construction site traffic , also on the U3 and U4 . The vehicles were gradually put into operation from 1988 to 2005.
development
The development of the subway type began in 1986. Initially, the manufacturers LHB (wagon construction part) and ABB (technical equipment) relied on the experience gained with the DT3-DAT . The new train should stand out from the older vehicles with its futuristic design, reduced noise emissions, increased safety and greater economy.
The first unit was presented to the public on May 30, 1988; use in passenger service began on October 17 of the same year.
By 2005 a total of 126 double multiple units had been handed over in six delivery series.
Car construction and technology
The DT4 are four-part vehicles that run on six bogies. Theoretically, a DT4 multiple unit consists of two self-sufficient, permanently coupled quarter trains, which, however, cannot run without the other quarter train. The second and fifth bogies are driveless bogies, similar to Jakobs bogies .
The car body was made of lightweight steel . Two double pivoting sliding doors have been installed on each side of each individual wagon, there is no transition between the individual wagons.
The first two series are equipped with compressed air doors, which were originally opened using two sliding levers each. These were replaced by a push button around 2003. In the early days, these doors closed particularly quickly, which resulted in a high level of noise and high material stress. The locking mechanism was therefore significantly slowed down afterwards. From the third series onwards, significantly quieter electric doors were installed, which had previously been tested in the DT4.2 140 and which had a reversing device .
All DT4 are driven by three-phase motors. From the third series onwards, another type of converter was installed, which generates a particularly characteristic start-up and braking noise. They enable trains to accelerate much more smoothly, since the first two series can still be recognized today by strong vibrations when starting up. In the sixth and last series, different converters were used again, which, together with a modified control system, are responsible for ensuring that this series cannot be electrically coupled to the other vehicles. The last two DT4.5 vehicles, 209 and 210, were equipped with the new equipment for test purposes and are therefore referred to as DT4.56.
For the first time in the history of the subway, the vehicles were painted in a color scheme with a white base coat, a wide light gray stripe and a red stripe. For delivery, cars 101 to 186 received front panels in which the red HHA logo was engraved. From the DT4.5 onwards, a significantly darker shade of gray was used and the front panels were smooth so that the new Hochbahn logo could be affixed. The new front panel was retrofitted to all other DT4s around 2005. Some older DT4s were also given a new paint in the DT4.5 colors before the interior was modernized due to paint damage.
A smaller detail are the LCD train destination displays, which were built into the front sides as standard from the DT4.5. All previous DT4s were delivered with electrically controlled target scroll belts , which were only occasionally replaced by other displays ( e.g. a flip dot matrix display as a test mode in the unit 186).
Passenger compartment
In contrast to the 2 + 1 seat layout of the DT3, a conventional 2 + 2 layout was used again for the DT4. Due to the crowning of the car body, the center aisle of the car could still be kept sufficiently spacious. The seats were fitted with spring core upholstery ex works with a check pattern in pastel colors. From the DT4.3, hard shell seats with fabric covers and a different pattern were used, which were later retrofitted in most of the DT4.2.
In order to ensure a high level of subjective safety for passengers, especially after experience with, for example, arson attacks in the 1980s, all multiple units are equipped with large windows at the ends of the cars and emergency intercoms . In addition, the DT4 was the first underground vehicle in the world to be equipped with a sprinkler system for fire fighting in the passenger compartment.
When the fifth series was ordered, the interior was heavily redesigned. The colors blue and silver now dominated, which is mainly reflected in the wall colors and the seat cushions. In addition, the handles were made more rounded and folding seats were installed on the rear walls of the driver's cab. This new design was also used in the DT4.6 and served as a model for the third redesign of the DT3 from 2007 onwards .
The DT4 was (after a test phase in the DT3 multiple unit 833) from 1996 onwards the first generation of underground trains in Hamburg to be equipped with monitors for passenger television. In addition to the line, the next stop and the time, regional and national news, the Hamburg weather, upcoming timetable changes and advertising (for companies in the vicinity of the next stop) are shown on the monitors. Originally two monitors were installed in each car (or retrofitted in older DT4s), these were later reduced to one in order not to have to buy new monitors for the last series. Since 2019, the monitors have been replaced by larger screens in 16: 9 format . The conversion should be completed by 2022, when there will be two monitors in each car.
Modernizations
When new train destination tapes had to be printed to swap the U2 and U3 lines east of the Berliner Tor in 2009, the opportunity was taken to replace the rolling tape displays with orange LED displays on all vehicles that did not already have LCD displays . if necessary, can display every stop as a train destination.
Due to the aging interiors, it was decided at the end of the 2000s to subject the DT4 to an interior redesign. The seat covers are replaced by new covers in the red DT5 pattern (and in the case of the DT4.1 the last spring core seats are replaced by bucket seats), the walls are painted in new colors and - as with the DT4.5 and DT4.6 - folding seats are added built into the cab rear walls. In the door areas, seat cushions were attached to the back walls of the seats and all stickers were redesigned. After all 30 multiple units of the first series were rebuilt between 2011 and 2015, the redesign took place in the years 2015 to 2018 for all DT4.2. The program is to be continued for the younger series until further notice. During the modernization, all railcars will also receive a foil in the paint scheme of the DT4.5, unless a new paint has already been applied in these colors.
Between 2013 and 2015, multiple units 141 to 150 (with the exception of 142) were converted to the more modern electrics of the DT4.6. This was done in order to obtain urgently needed spare parts for the aging technology of the DT4.1 and DT4.2. The vehicles, which are now referred to as DT4.26, are new builds in the electrical sense and since the conversion can only be coupled with the DT4.6.
photos
DT4 train in the Hauptbahnhof Nord underground station (U2)
DT4 train in Überseequartier underground station (U4)
Two DT4 units in the HafenCity Universität subway station (U4), the different shades of gray in the various paint finishes clearly visible
Interior view of the DT4.2 in the original design
Inside view of the DT4.5 train
DT4 train: modernized design based on the DT5
Others
- The unit 140 has already served as a test vehicle for a wide variety of design changes throughout its history. 140 is the only one with DT4.2 electric doors, which have been installed as standard from the DT4.3 onwards. Car 140-4 served as a test vehicle for the interior design of the DT4.5 and DT4.6, while the interior redesign was tested in the other end car 140-1. The interior of the 140-4 was adapted to the type DT4.6, that of the 140-1 was adapted to that of the DT5. In 2013, the interior was standardized again as part of the redesign.
- Until the 1990s, some DT4s of the first series had the baptismal names of various parts of the city that could be reached by underground, for example “Borgfelde” for car 105. Most recently, car 130 was called “Norderstedt” to extend the U1 to Norderstedt. All baptismal names have since been removed.
- In the early years, numerous DT4s were equipped with outdoor advertising, but this decreased more and more over the years. Most recently, cars 121 and 128 advertised a lottery company and car 141 with the slogan “Hamburger Weg”. Since these advertisements were deleted in 2013 (as of March 2017) there are no longer any DT4s with outdoor advertising.
- Train 130 from the DT4.1 sub-series was financed together with train 129 by Verkehrsgesellschaft Norderstedt (VGN). Hence the original name "Norderstedt" for unit 130.
- The technology used, the water-cooled electric motors and low-noise disc brakes, lead to particularly low noise levels. As a result, the Federal Environment Agency honored the DT4 vehicles as the quietest underground vehicles in Germany.
- Unit 120 received larger monitors for passenger television on a trial basis in 2019. Since autumn 2019, all DT4s have been gradually converted to the new screens.
See also
Web links
Individual evidence
- ↑ a b DT4 vehicle list. Retrieved November 7, 2018 .
- ↑ Andre Loop: Hamburger Hochbahn 1990 - 2nd part. May 3, 2010, accessed November 7, 2018 .
- ↑ a b DT4 140 - The test train. Retrieved November 7, 2018 .
- ↑ U-Bahn picture gallery, type DT 4.1 to 4.6, units 101 to 226 / DT4 186-12, HHA-U Bahn, AB. Retrieved November 7, 2018 .
- ↑ DT4 in the picture. Retrieved November 7, 2018 .
- ↑ DT3. Retrieved November 7, 2018 .
- ↑ New passenger television: One for U- and S-Bahn. Retrieved on November 7, 2018 (German).
- ↑ More widescreen for customers on the subway. Hamburger Hochbahn AG, November 1, 2019, accessed on May 24, 2020 .
- ↑ DT4 passenger compartment. Retrieved November 7, 2018 .
- ↑ U-Bahn of Hamburger Hochbahn AG, (c) Hamburg fleet lists 2005-2018. Retrieved November 7, 2018 .
- ↑ Welfare-reducing social and ecological costs in Hamburg - Major inquiry from MPs Dr. Anjes Tjarks, Phyliss Demirel, Katharina Fegebank, Heidrun Schmitt, Jens Kerstan (GREEN) and parliamentary group from August 13, 2013. Drs. 20/8914. (PDF) Citizenship of the Free and Hanseatic City of Hamburg, September 13, 2013, p. 5 , accessed on January 23, 2016 .
