Re: Speedrail technical stuff

["G.Fry" <fryg@sydpcug.org.au>]

Based on the proposed hourly frequency and 80 minute travel time, a
train would only have to make 3 crossings on the trip - the first within
15-20' of Sydney, one half way (Moss Vale?) and one 15-20' from
Canberra. On this basis a single track is the only sensible option
provided the crossing loops were of a reasonable length and that the
trains kept to a strict timetable. Both of these requirements would I
imagine be fundamental to the whole concept.

Graham Fry

Maurie Daly wrote:

> In article <35d430b6.18803089@news.ozemail.com.au>
> ajwright@ozemail.com.au (Ashley Wright) writes:
> >From: ajwright@ozemail.com.au (Ashley Wright)
> >Subject: Re: Speedrail technical stuff
> >Date: Fri, 14 Aug 1998 12:46:52 GMT
>
> >On 14 Aug 1998 03:56:56 GMT, dbromage@fang.omni.com.au (David
> Bromage)
> >wrote:
>
> >>In recommending Speedrail, he suggests that single track would be
> the most
> >>cost effective considering the populations of Sydney and Canberra,
> and the
> >>low population density along the route. He also recommends
> earthworks for
> >>double track to allow for future growth and possible expansion of
> the
> >>system.
> >>
> >>Now here's the interesting bit. Speedrail does in fact plan only
> single
> >>track with earthworks for double. The line would be doubled as part
> of the
> >>extension to Melbourne. The high speed line is to leave the main
> south at
> >>"Glen Apline". I can't find Glen Alpine on any map, but it does have
> a
> >>postcode two numbers beyond Campbelltown. I wonder if this means
> Glenlee
> >>Junction?
> >
> >  I wonder just how the signaling system will work then!! I have read
>
> >about TGV type signaling, but have never seen anything about high
> >speed sigal line signaling. Could be interesting.
>
> In fact. for train densities of only around 1 train per hour in each
> direction averaged over the day, you could get away with single track
> all the
> way to Melbourne.
> Single track has a very high carrying capacity , as long as
> all the trains run on time , and the crosses and crossing loops are
> well
> planned in advance.
> With high speed pass trains this should be easy to acheive.
> The interesting question is , does the Speedrail bid anticipate later
> doubling
> the track if needed, or is it based on a single track solution.
> The overall cost , for Sydney to Canberra , based on single track
> seems a tad
> high to me.
>
> cheers
> MD