In article , John Rowland
writes
Anyway, isn't there a never-used twin-track branch of the Thameslink tunnel
stretching to Euston along the north side of the Met?

No. There was a single-track tunnel from St.Pancras to meet the (now)
Thameslink tunnel.

Although a bit was
destroyed by the widening of the Met in the 1930s

For "a bit" read "just about all".

the Maiden Lane Curve.
Do you mean the York Road curve?

No, he means the tunnel that links *west* to *north*, branching off the
York Road curve about half way down.

http://www.davros.org/rail/culg/hammersmith.html, as I've already
said, has diagrams.

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Clive D.W. Feather | Home:
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