We had a very brief argument about this a month or so ago; Barry Salter
said they did, i said they didn't, and Clive threatened to excavate as
much of north London as was necessary to find out.

This is not an authoritative answer, but i did finally notice that
according to Quail, they do cross, and the crossing is indeed a little way
south of Harringay Green Lanes; probably too far to build a station with
interchange, though.

On a more general note, how can one go about getting accurate information
about the routes of underground railways? Are there some sort of official
maps somewhere?

tom

--
Pizza: cheap, easy, and portable. Oh, wait, that's me. Never mind. -- Edda