The Open Guide to London: the free London guide - Differences between Version 6 and Version 5 of East London Line
Contents are identical
It goes through Brunel's 1840s Thames Tunnel, which is the oldest extant tunnel under a navigable river. It's due for extension both northwards (over the old Broad Street-Dalston viaduct) and southwards (possibly sharing Railtrack lines towards Wimbledon and Croydon).
{Todo: CLUG, rolling stock and thetube links}
See also http://wikipedia.org/wiki/East_London_Line
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