Re: Crossing loop design (r.e. Southern Aurora crash)

[Railway Rasputin <bob@fastlink.com.au>]

Krel wrote:

> >Maybe in NSW, but in Vic a home signal protects something physical, the old
> >exam question went something like this: "What do home signals protect?"
> >
> >Answer: "Home signals protect Points, junctions, fouling points of an adjoining
> >or crossover road etc, (Rod, Krel help me out here, it's a while since I took a
> >VR exam!)
> >
> >Starting signals govern the entrance into a double line block section, think of
> >a starter as similar to a staff, like a staff, if the starter is not at proceed
> >you are not allowed into the section.
> >
> As clarification:-
>
> In Vic they are all Homes except the signal that governs the entrance
> to a Double Line Block (NSW - block telegraph) section. this signal is
> called a starter as it is placed after all points and crossings. As a
> rule the first signal at a station is called the Home Arrival and the
> last is called the Home Departure.
>
> In NSW they are all Homes except the signal that controls the entrance
> to ANY section. This signal used to always be called the starter even
> if it controlled a fouling point (eg at the end of a crossing loop).
> Later installations have introduced the concept of a Home/Starter.
> This is one signal that does two jobs - is controls a
> station/points/junction/etc and ALSO controls the entrance to the next
> section. Hence it is a Home and a Starter. On the deep south CTC if
> the last signal is at the end of a loop it is a Home/Starter, if it is
> past the end of a loop it is a Starter and the signal at the end of
> the loop (ie the second last signal) is called a Home. As a rule the
> first signal at a station is called the Home signal, and each
> succeeding signal is numbered - second Home, Third Home, etc. until
> the last which is either the Home/Starter or the Starter.
>
> >In Vic, there is a distict difference between a starter and a home, they even
> >have a different set of exceptions to pass at stop.
> >
> Yes, same in NSW. The rules for getting past a Starter are more strict
> than a home.
>
> Cheers
>
> Krel
>
> Just another eccentric crank.

Imho In NSW we seem to be leaning towards 2 types of signal.
Controled and Automatic.

rgds