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Hamburg U-Bahn Type DT3
The Type DT3 is a three-car electric multiple unit train built for the Hamburg Hochbahn. They were first introduced in 1968 to replace the 1911-1929 built T cars and to speed up the journey times on the U1 line.
== Description ==
With the continued expansion of the subway network in the 1960s and 70s, and the desire for greater efficiency in operating procedures caused in developing a new type of subway units based on the older DT1 and DT2 units. The DT3 resembles to the DT2 in appearance, but the big difference in them was in the engineering of the cars. Technically the DT3s were based on the DT1s which were compatible to DT3 after some customization and they can be coupled. Instead of two cars the DT3 have got a third car which is 10.72 meters long. Because of the greater overall length of a 9-car train made up of three units instead of an 8-car train made up of four units of DT1s or DT2s some platforms on the U1 line (e.g. on the Langenhorn branch) had to be extended. The DT3 trains are more powerful than its predecessors; they have been added with additional traction motors and therefore have got a much stronger acceleration. Thus, the maximum acceleration is 1.2 m/s², in contrast to the DT2 with 0.8 m/s². Moreover, the speed limit was increased to 80 km/h (50 mph) again, because the units were mainly built for the longest subway line in Hamburg, the U1 line.〔:de:HHA Typ DT3 Translation from the German Wikipedia article.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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