Hamburg U-Bahn Type DT3

• DT3: non-refurbished sets, all withdrawn • DT3-LZB: sets 921 to 926 fitted with Linienzugbeeinflussung (LZB) in 1980/1981 File:Saarlandstraße - Hamburg (13284980545).jpg|DT3-E with new polyester cab ==Interior==

The trains have a 2+1 seating arrangement. Refurbished trains are equipped with a passenger information system since 2000. File:DT3-E Hamburg Innenraum.JPG|Interior of a refurbished DT3-E train ==Technical specifications==

The trains are built to an articulated design, and are formed as three-car units. The end cars are based on the Type DT2, with a long intermediate car in-between. They are equipped with high voltage cam switches, quill drive, and a microprocessor-controlled wheel slide protection system. File:UbahncockpitDT3.jpg|Driver's cab of a DT3 File:Hamburg U-Bahn Hauptbahnhof Nord.JPG|Side shot of a DT3 at Hauptbahnhof Nord station DT3-LZB Six sets were fitted with Linienzugbeeinflussung (LZB) in 1980 and 1981 and were used for driverless operation trials on the branch to Großhansdorf station. The automatic operation was observed by a conductor permanently sitting in the cab, they also had to dispatch the train in stations. The experimental operation ended in 1985, since then the units were in normal operation. During the refurbishment of many DT3 units in the 1990s, the DT3-LZB only received the interior and car body refurbishment and did not get their front replaced. The LZB trains all were retired on 9 December 2016 and scrapped in April 2017. ==History==

The trains were built between 1968 and 1971. Refurbishment Many of the units were rebuilt between 1995 and 2000 and received a newly designed polyester front ends, a new interior design, and windows between the cars and between the driver's cab and passenger compartment. This refurbishment will include the replacement of the old control equipment, the fitting of door closing alarms, as well as the renewal of the interior and car bodies. The improvement was going to make the refurbished cars incompatible to the other DT3-E, thus they will be designated as "DT3-N" to distinguish them from non-refurbished cars. ==References==