The Type DT4 is a four-car
electric multiple unit
An electric multiple unit or EMU is a multiple-unit train consisting of self-propelled carriages using electricity as the motive power. An EMU requires no separate locomotive, as electric traction motors are incorporated within one or a numbe ...
(EMU) train type operated by the
Hamburger Hochbahn AG on the
Hamburg U-Bahn system since 1988.
Formation
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.
Interior
The interior consists of transverse seating bays.
passenger information displays are to be fitted to the whole DT4 fleet, with works scheduled to be completed in 2022.
Technical specifications
The trains have steel car bodies and a
three-phase
Three-phase electric power (abbreviated 3φ) is a common type of alternating current used in electricity generation, Electric power transmission, transmission, and Electric power distribution, distribution. It is a type of polyphase system empl ...
propulsion system.
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
An insulated-gate bipolar transistor (IGBT) is a three-terminal power semiconductor device primarily used as an electronic switch, which, as it was developed, came to combine high efficiency and fast switching. It consists of four alternating lay ...
-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.
History
The development of 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.
References
External links
Hochbahn fleet information
{{Hamburg U bahn stock
Hamburg U-Bahn
Electric multiple units of Germany
750 V DC multiple units
ABB multiple units