Streatham Common
The Blackfriars move does occur three times on a Saturday morning, but none of the Selhurst calls are advertised so not valid for the game. I can't see an advertised fast Selhurst - Blackfriars. Just as a point of interest, it would be possible to board / alight said Saturday morning trains.
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Streatham Common was an error by myself, I am just checking whether I have accidentally made a valid and fatal move.