In article , Walter Briscoe
writes
In recent thread, there is a reference to the 1941 tube map at
http://homepage.ntlworld.com/clive.billson/tubemaps/1941.html to a
connection from Earl's Court to Latimer Road via Addison Road and
Uxbridge Road.
[...]
I can find no relevant words in Clive Feather's wonderful work at
www.davros.org/rail/culg/.

It's in the Hammersmith & City Line file, plus there's some pre-1906
stuff in the Circle Line file (look for "Middle Circle").

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