Re: Approach to Sydney Central

["Ben O'Regan" <ben@NOSPAMFORemiratespark.com.au>]

Could you please explain the difference between a tangential turnout and a
normal one.

Thanks,

Ben

C. Dewick <craigd@lios.apana.org.au> wrote in message
news:88sg6c$c63$1@jedi.apana.org.au...
> "Hubert Lam" <hubert@imap4.com> writes:
>
> >Hmm...Dr. Bradfield's ingenenuity. Now why the hell is that place a
complete
> >dump? Seems like CityRail/State Rail has decided that most of the scrap
> >metal and rubble should be placed there. What a great place to do it!
Right
> >next to the approaches to Australia's largest railway station...and we
have
> >something called "The Olympics" coming up...wonder if they'll bother
> >cleaning that crap up/
>
> It does get cleaned up. 99 percent of that rubbish is broken up trackwork
> and turnouts which have been removed from service during the Sydney Yard
> track remodelling over the past two years.
>
> >Also the flyover structures look quite old and so does the track (i.e.
> >wooden sleepers, no continuosly welded rail). Any plans for that to be
fixed
> >before September?
>
> They are old - the City Railway construction started around the end of WW1
> and the flyovers were built in the early 1920's MCR. No reason to rush out
> and replace them. Besides, the logistics of replacing them all in such a
> short space of time would be horrendous. 8-)
>
> There are no concrete ties there for a reason - the ballast bed isn't deep
> enough to support concrete, and the extra trackbed vibration would
actually
> be detrimental to the longer-term stability of the structures.
>
> Concrete ties are nearly twice as high as timber ones, and they have much
> worse vibration damping properties. The turnouts are being replaced
slowly -
> Sydney Yard has almost been finished now with all tangential turnouts and
> higher speeds (40 kph through almost every road except the platform
tracks)
> that before.
>
> Regards,
>
> Craig.
> --
>             Craig Ian Dewick            |       Stand clear - jaws closing
>  Send email to craigd@lios.apana.org.au |  Visit my Australian rail
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