D7666 wrote:

On Jan 26, 9:30*am, wrote:

You'd have enough trouble just getting men with
shovels down those tiny tunnels never mind any construction machinery.


The running tunnel is 9 ft diameter : the running tunnel between
stations are all double track.

9 ft is a good deal larger that many site construction tunnel or even
final tunnels e.g. sewer or water tunnels that have construction
railways in them.


The notorious heading through the railway embankment and under the
Blockbuster store in Fallowfield, Greater Manchester to gain access to
the cash machine was only about 1.3m x 1.3m. That's about 4' 4".

No railway in that tunnel, though. ;-)