Re: MORE TRAMWAY TRIVIA

["Chris Stratton" <stratton.chris.cp@bhp.com.au>]

Ron BEST wrote in message ...
>
>What if a road happens to cross above the tunnel? AFAIK, the structure
>located on the main western line in Sydney between Sydney Central station
>and Redfern station is officially called "Cleveland Street Tunnel" - I
think
>it started out life as a bored tunnel, but has been extended since. It
>certainly carries plenty of live loading! (Regent and Cleveland Streets,
>both with tramways at one time. )
>
>I don't think you can make a distinction as to how a tunnel was built
>(bored, cut and cover, Armco culvert etc.) I think it comes down to the
>amount of cover - bridges cover whatever they cross for a relatively short
>distance (e.g. the width of a road or railway line), whereas tunnels cover
a
>relatively long distance. So, underground railways run in "tunnels",
however
>built. My example above of the Cleveland Street "Tunnel" would be a bridge,
>by my definition. But what about where the City Link structure runs above
>the Upfield railway in Melbourne? A very long, very skewed, bridge?
>Certainly not a tunnel!
>Rgds
>Ron BEST
>
>
What about Croom tunnel near Oak Flats. It is very short, has very little
cover above it and has a road across the top, but is still definitely a
tunnel. It would be shorter than the Cleveland Street Bridge/Tunnel.
--
Regards,
Chris Stratton
Wollongong, NSW, Australia