A new geographical map of London’s railways has been released by TfL in response to a freedom of information request. The request strangely appears to be from last September, hence the map is a little out of date in terms of who runs what. It does include future plans, some of which are yet to materialise, so it’s still useful. The map is a large PDF file
It’s only taken 23 days, but finally you can look up Oyster fares from Dartford on the single fare finder. The zonal map will sadly not be changed until later in the year.