If the line was tunneled with TBMs, resulting in lined tubular tunnels like
the Sydney metro tunnels, I imagine that this would create a tighter
clearance for double deck trains. All previous Sydney railway tunnels had
vertical walls. Am I correct?

Tony P

On Tuesday, 5 December 2023 at 19:49:57 UTC+11 Tony Galloway wrote:

> The type of tunnel construction precluded having refuges, and with the

> alternative route through Sydenham available, diversions were the easier

> option if anything failed in the tunnel.

>

> Apparently.

>

> Tony

>

> > On 5 Dec 2023, at 17:14, Matthew Geier mat...@...>

> wrote:

> >

> > On 5/12/23 16:59, Robert Taaffe wrote:

> >> When the airport line was designed it was intended that it would never

> be maintained under traffic, only at night or during possessions.

> >

> > So the assumption was that things would only break on schedule ?

> >

> > Actually given the state of some of the Sydney Citadis already, I think

> that thinking is being applied to them to.

> >

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> .

>

>