Hermannplatz U-Bahn Station, Berlin 🇩🇪. Probably one of the easiest transfers between two subway lines (U7, U8); one short escalator between the two platforms.
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Wuhan Metro at Zhongnan Lu (中南路) and Hongshan Square (洪山广场) has a consecutive pair of transfer stations such that you can transfer cross-platform for *all* combinations. Hong Kong MTR does the same Prince Edward (太子) and Mong Kok (旺角站).
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Replying to @davidbaron @urbanthoughts11
Taipei Metro's Dongmen (東門) Station is another good example of a busy station with "typical transfers straight across" where the atypical transfers do require the escalator.

Jul 9, 2022 · 7:34 PM UTC
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Transferring between Beijing lines 2 and 13 and Xizhimen (西直门) struck me as one of the longest subway transfers I've ever had to do. It is an unusual case, though, but it's probably the Beijing subway transfer that I used the most times.