Jubilee Line Extension

London, 英国中的铁路服务

Swan House 32-33 Old Bond Street, London W1S 4QJ

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A look at the Jubilee Line Extension, which was opened throughout to connect with the original line on 20th December 1999. The completed …

问:

Why Four Rails?

答:

What's really questioning me is, why they use a positive (+420V) and a negative (-210V) rail? AFAIK LUL has the only system...

答:

糟糕! 出现问题了，请几分钟后再试

Streetside

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