Re: Tempe - Incorrect Signage?

[BEE EFF <mcreely@pnc.com.au>]

Chris,

Green over Green at a Turnout generally means you are not changing direction of
travel ie:still heading in the down direction on the down line(eg:Goods Line at
Sefton heading South). Top or Two Yellows generally indicates change of
direction.

Yes I know there will be exceptions to this rule as with any other in NSW
ie:Accept Signals at Balmain Road(there are two and according to the rules there
shouldn't be).

Hope this is of more help

Regards BEE EFF

Chris Downs wrote:

> BEE EFF <mcreely@pnc.com.au> wrote in message
> 3A860FF6.DF6BBAF4@pnc.com.au">news:3A860FF6.DF6BBAF4@pnc.com.au...
> >
> >
> > Chris Downs wrote:
> >
> > >
> > > Green over yellow is an ambiguous aspect (G/Y=1.5?).  If it were to
> pulsate
> > > for an advance junction indication and remain steady for the next signal
> at
> > > caution the ambiguity would be removed.  This doesn't excuse what happened
> > > with SL-2 but the signals purpose is give the driver sufficient
> information to
> > > drive the train, not to exercise their mind in a game of second guesses.
> > >
> > > ....................and what was the official determination/explanation of
> > > Concord West a few years ago?
> > >
> > > Chris
> >
> > Chris,
> >
> > What they have done on some signals now is to add rabbits ears(rows of white
> > lights) above the upper set signal lights to indicate the direction of
> travel .
> >
> > These are placed a couple of signals in advance of a turnout so that the
> driver
> > knows in advance of the turnout what is happening(very useful for large
> > freighters-means you can maintain a constant speed  to clear the turnout
> > quicker), some of these signals are at Cabramatta-2 indications(heading to
> the
> > city - via Granville or Rgents Park), Merrylands-3 indications(Y-link to
> > Parramatta, over flyover to Granville/Clyde and wrong line to
> Granville/Clyde).
> >
> > Drivers have been petitioning for a while to have these installed between
> Rhodes
> > and Concord West(heading towards the city for sometime, with no avail)as you
> get
> > 1.5 just after Rhodes which means the next signal could be 2 yellow(turning
> out
> > onto goods line)or 1(green over red)heading towards Strathfield(not good if
> on a
> > freighter as there is no way back to goods line without going via city
> circle).
> >
> > Must say they remove a hell of a lot of ambiguity from driving trains and
> should
> > be installed everywhere(would make life easier for everybody- Freights and
> > Electrics)and would no doubt speed the system up to no end.
> >
> > Hope this helps
> >
> > Regards BEE EFF
>
> Thanks, definitely helps.
>
> Next question:  What's the criteria for a turnout signal to display a Yellow
> over Yellow aspect (eg down main and down suburban at Seven Hills for the down
> Richmond branch) versus a Green over Green aspect for the turnout (such as the
> up at Turrella)?  In both cases the preceding aspect has rabbit's ear(s),
> albeit as Tezza pointed out the straight ahead ear at Turrella has been
> covered despite some use I thought when initially installed and Seven Hills
> have no straight ahead ear.
>
> Is it speed, 60km/h+ or 70km/h+?
>
> And did Turrella get its straight ahead ear originally because it was a Green
> over Green for straight or turnout junction?
>
> Ta
>
> Chris