In message , David
Cantrell writes

I noticed this morning that there are Oyster readers at City Thameslink,
along with signs urging people to fondle them as they go past.

Why? If you have a season ticket on your Oyster then you can travel
legitimately but don't need to touch in/out. But if you only have PAYG
then I didn't think it was valid on Thameslink.

PAYG is valid between Kentish Town and Elephant/London Bridge/Moorgate
(including Blackfriars):

http://www.tfl.gov.uk/tfl/fares-tick...YG-Diagram.pdf

--
Paul Terry