On Mar 30, 11:32*am, Chris Sanderson wrote:
Err, nothing will need to be 'widened' to any great extent, the
Central Line is paralleled at the southern end by the essentially
disused 'New North Mainline' whose formation HS2 will use. Your idea
would also miss out OOC - a vital interchange for Heathrow, services
from the West Country and the Thames Valley, and crucially Crossrail.
The current route is by far the most sensible, which is presumably why
its been chosen...

Indeed, the UK planners are very fortunate to have a virtually
unutilized four track formation out of London. This presents an
enormous cost saving.

OTOH, HS2 as proposed is overkill.