In message
, at
15:23:22 on Wed, 10 Mar 2010, Mizter T remarked:

with regards to the 'Thameslink box', it's sited where it is at the
north end of St P because that's kind of the only place it could be -
it's actually north of the original St P building, and stretches under
Midland Road and perhaps a sliver under the corner of the British
Library car park. I get the feeling that building it under the old St
Pancras station would have been infeasible or at least impractical.

Yes, the box is in the only place it would fit, given the alignment of
the tracks. But the exit could have been somewhere near the toilets
adjacent to the Eurostar check-in, rather than halfway to Camden.

More radically, the Eurostar platforms should have been at the
undercroft level, with the Midland Mainline and Kent Domestic and
Eurostar check-in etc on the original level.
--
Roland Perry