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After World War II the trains of the Berlin U-Bahn were worn out, making a new series of trains necessary. From 1957 on the new ''D'' type trains were delivered (also called Stahldora/Steel Dora). They were made of steel, making them very heavy. In 1965, the ''DL'' type was developed, which was constructed from lighter metals (also called Dora). This way, weight was reduced by 26%. Like in earlier types the seats were located along the sides of the train. ==Class D== The D type cars have been introduced in various phases: *D 55: The test vehicle (2000/2001), which is on the Line C II (Mehringdamm - Tempelhof) *D 57: 26 trains (2002/2003 - 2052/2053), which is on the Line C I, during the opening of the line to Tegel (now known as U6). *D 60: 30 trains (2054/2055 - 2112/2113), which is on the Line G (now known as U9, the line was built as an alternative line when the Berlin Wall is built). *D 63: 36 trains (2114/2115 - 2184/2185), which is on the Line C I, during the opening of the line to Britz (now known as U7). *D 65: 44 trains (2186/2187 - 2228/2229), which is on the Line C II, during the extension to Alt-Mariendorf. On 1974 with the introduction of F type cars, the D 60 trains were redeployed to Line 6 and D 57 trains were redeployed to Line 8. Because the BVB (the East Berlin public transport authority) needed more trains for their new route to Hönow, they bought 98 cars of this type from the BVG in several phases: *1988: 2002/2003 to 2018/2019, 2022/2023 to 2052/2053 (when the U5 is extended to Elsterwader Platz), they were renumbered to 110 300 to 110 349. *1989: 2054/2055 to 2112/2113, with the exception of 2072/2073, 2076/2077 and 2100/2101 (when the U5 is extended to Hönow), they were renumbered to 110 350 to 110 401. They were called ''DI'' in the east. Of course, they were painted in the East Berlin color scheme of ebony and yellow. 7 trains (110 386-110 397, also known as 2096 to 2099 and 2102 to 2109) all returned to BVG. After the merger of BVB with BVG, these trains continued to deploy on the U5, U6, U7 and U8. The last trains of the 'D' type were retired in 1999, and they were sold to Pyongyang Metro, another communist country which is located in North Korea. There are only two museum trains, 2000/2001 (Prototype) and 2020/2021. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「BVG Class D」の詳細全文を読む スポンサード リンク
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