On Tue, May 25, 2010 at 04:51:32PM -0700, lonelytraveller wrote:

The post office railway is disused.

Why didn't they just widen the tunnels and reuse them for Crossrail,
instead of digging hugely expensive new ones?

The PO railway is such a small gauge (9' diameter tubes) that to widen
them would require almost as much work as boring new tunnels.

Also the stations are a lot shallower than the bulk of the tunnels, with
1:20 inclines either side which would be ... inconvenient.

--
David Cantrell | Godless Liberal Elitist

Hail Caesar! Those about to vi ^[ you!