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S21 is a term of the Berlin S-Bahn with several usages: * A temporary line, which operated during the 2006 FIFA World Cup and during service reductions in 2009. * A planned second north-south route, of which the first section is under construction * A proposed line on that route == History == |} The two former services were always operated with 15 kV, 16.7 Hz AC overhead lines while all other S-Bahn lines in Berlin were and are operated with 800 V DC third rail. It was operated by Deutsche Bahn. 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「S21 (Berlin)」の詳細全文を読む スポンサード リンク
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