"The Gardener" wrote in message
...

It would be great if the Northern City could be extended south to
Bank, or further.

Sadly, that's very unlikely as it's not that deep a line at Moorgate,
and there are building foundations in the way. In any case, without
platform lengthening, it probably would not be justified.

If I remember rightly, it's not just any building foundations, but the the
Bank of England's vaults, that would thwart this particular extension.

Martin