On Mar 12, 4:49*am, "Basil Jet"
wrote:
Shouldn't the high speed line run from St Pancras, as an extension (via
reversal) of the Kent domestics?

The HS2 plan for Euston is big - a £1 billion rebuild leading to 10
high-speed platforms and 14 'classic' platforms. It also commandeers
some space beyond the western edge of the current station perimeter.

See the PDF leaflet:
http://www.dft.gov.uk/pgr/rail/pi/hi...df/leaflet.pdf