The Type DT4 is a four-car electric multiple unit (EMU) train type operated by the Hamburger Hochbahn AG on the Hamburg U-Bahn system since 1988.
7-403: Every DT4 train consists of four cars, which are formed as two articulated half-sets with two cars each. The cars don't have gangways , but feature windows in the inner car ends. The interior consists of transverse seating bays. Widescreen passenger information displays are to be fitted to the whole DT4 fleet, with works scheduled to be completed in 2022. The trains have steel car bodies and
14-449: A three-phase propulsion system. Thyristor inverters are used in the DT4.1 and DT4.2 trains, and the DT4.3 through DT4.5 trains use GTO-pulse inverters. The DT4.56 and DT4.6 trains use IGBT -pulse inverters. Each four-car set has four powered bogies and two non-motored jacobs bogies . The powered bogies are equipped with water cooled three-phase asynchronous motors . The development of
21-505: A number of cars which are semi-permanently attached to each other and share common Jacobs bogies or axles and/or have car elements without axles suspended by the neighbouring car elements. They are much longer than single passenger cars . Because of the difficulty and cost of separating each car from the next, they are operated as a single unit, often called a trainset . Articulated passenger cars are becoming increasingly common in Europe and
28-479: Is also articulated. Articulated cars have a number of advantages. They save on the total number of wheels and bogies , reducing initial cost, weight, noise, vibration and maintenance expenses. Further, movement between passenger cars is safer and easier than with traditional designs. Disadvantages primarily relate to lesser operational flexibility. For example, additional cars cannot readily be added to an articulated trainset to accommodate peaks in traffic volume and
35-579: The Great Northern Railway in Britain built suburban car sets new . In the 1930s, a number of streamlined trains built for the London and North Eastern Railway also made use of articulated technology. Manufacturers such as Gunderson make articulated, low-floor "well" cars , articulated trailer carriers and articulated autoracks . At 34 m (111 ft 6 + 9 ⁄ 16 in) long, Modalohr
42-506: The DT4 began in 1986, and the first unit was completed on May 30, 1988. Passenger service began on October 17 of the same year. The DT4 trains are being refurbished since 2011. They receive a newer interior appearance, similar to the interior of the DT5 trains . One car of set 140 was refurbished for testing purposes in summer 2010. Regular refurbishment started in 2011. Articulated car Articulated cars are rail vehicles which consist of
49-453: The US. The passageways between the car elements are permanently attached. There is a safety benefit claimed that if the train derails, it is less likely to jackknife and modern construction techniques prevent telescoping . Articulated cars are not, however, a new idea. Many railways in Britain during the first half of the 20th century frequently rebuilt older, shorter cars into articulated sets, and
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