Not a talk about the tube network, but a presentation about some of the lesser known aspects of the capital. By Nick Catford on behalf of the Norbury and South London Transport Club
East Croydon Community Organisation
Community website for East Croydon, UK, area (mail@eastcroydon.org.uk)
East Croydon Community Organisation 
Nick Catford is an excellent speaker and this is a very interesting talk.
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