London Banter - View Single Post - Why the piccadilly to Heathrow , why not the District?

Robert Woolley · October 17th 03, 11:13 PM posted to uk.transport.london

On 17 Oct 2003 15:01:42 -0700, (Boltar) wrote:

"Cast_Iron" wrote in message ...
Boltar wrote:
Even if the picc continued running the main service to the
airport some
distruct trains could have used it occasionally to take up
the slack, the
same way that the picc and met run togather to uxbridge.

B2003

"They" could have done all sorts of things, if the cash was available. Are
you looking at this from a 1960s perspective or a 2000s one?

Why would it have cost more to run larger trains? The difference in tunnelling
costs would have been negligable just to make the tunnels a foot or 2 wider.

B2003
Not negligble.

The cost of the tunnel is going to be quite closely correleated to its
size. The bigger the tunnel, the more spoil to remove and the tighter
the engineering.

I would imagine that the surface area of sub-surface tunnels is much
larger than tube tunnels...

Rob.
--
rob at robertwoolley dot co dot uk