Re: Tunnels

["Derick Wuen" <cullend@webone.com.au>]

I suggest an "overbridge" becomes a "tunnel" when the rail route under it is
longer than the span across the tracks.

Cleveland Street bridge, at the entrance to Sydney Yard, was the site of
Tunnel Box. In Tunnel Box days I think the "bridge" might have conformed to
my suggested rule.



MattyQ wrote in message <37aacbdd.0@news.bris.corplink.com.au>...

<snip>

>I guess now would be as good a time as any to ask the question "What is the
>definition of a tunnel?". Most stated in this thread clearly qualify as
>tunnels but some are questionable.
>
>In Sydney, is the City Circle and ESR reffered to as tunnels or an
>underground railway? Some beg to differ. What about the newer "tunnel"
south
>of Bowen Hills in Brisbane or the one north of Beenleigh? Most of what is
>atop these tunnel is roadways but it is about 5 metres between the roof of
>the tunnel and street level.
>
>Would an extremely wide road over rail bridge (equivalent to 10 lanes)
>qualify as a tunnel? If so, you could say there is a tunnel just to the
west
>of Buranda where the Southeast Freeway crosses the Cleveland line. What
>about Westmead, where the Up Main dives under the Up and Down Suburbans?
>
>
>--
>Matt Smith
>Brisbane, QLD
>
>I never seem to finish anyth
>
>(Remove the 'Q' to reply).
>
>
>