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London's Trolleybuses and Tubes
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traildriver




Joined: 26 Mar 2011
Posts: 2701
Location: South Florida
PostPosted: Thu Nov 18, 2021 6:43 am    Post subject: Reply with quote
I wasn't aware of the old "fourth rail" system used by the Underground...had to look it up for an explanation on wiki.

Reminds me of the need for trolleybuses to have a 'return' wire...
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