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London Underground - tube trains
Lambeth Walker on Twitter: "Some old style London Underground ticket machines. Scarily I can remember all of these. #tube #London http://t.co/Hk3PoLmyMp" / Twitter
The secret ticket that only works in one tube station
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National Rail on Twitter: "@LawrenceTanner1 Hi, I believe this ticket is not valid on the tube and can only be used on National Rail services. Tickets that can be used on the