london - Pink Oyster reader did not reduce the fare correctly? - Travel Stack Exchange
Opening Page - Welcome To Railfanning London's Railways
How to pay and where to buy tickets and Oyster - Transport for London
TfL on Twitter: "Changing trains and not travelling through Zone 1 on @LDNOverground? Touch the pink card reader for the right fare http://t.co/uUUDwBJz5Y" / Twitter
London Underground: The pink touch in points throughout the Tube which means TfL gives you cheaper fares - MyLondon