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Re: This afternoon at Covent Gardens

Posted by fdtutf on Fri Nov 9 04:32:08 2018, in response to Re: This afternoon at Covent Gardens, posted by Express Rider on Fri Nov 9 00:22:53 2018.

I think there were concerns about an earth return resulting in excessive corrosion of underground pipes, and that's why they went with a fourth rail for current return.

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