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Re: Tunnels



Adrian Whichello wrote:
 
> Geoff Lambert <G.Lambert@unsw.edu.au> wrote:
 
> > WA: Sirling Range, +?
 
> I'm pretty sure there's all of one tunnel in WA and it's no longer used
> for trains. I've walked through it, it's now in John Forrest NP, along
> with a few bridges at what used to be National Park station. I thought
> it about the same size/length/loading gauge as Clarence tunnel near Zig
> Zag. Perhaps some Westralian can tell me why they felt the need for a
> tunnel in the first place - you do the return part of the walk along the
> formation that replaced it around the side of the hill and there's not
> really a lot of overburden on top of the tunnel.


The tunnel in WA was built for the same reason there was one on the SAR
narrow
gauge line to Broken Hill. 
They wanted one!
In both cases, it was possible, and probably cheaper, to go around, as
WA later
did.

John McCallum

> 
> "I wish to God these calculations had been executed by Steam!" C.Babbage
>