Targeted signalling system enhancements

[ozbob]

Discussion on ' Undertaking targeted signalling system enhancements to improve the reliability of increased peak services '.

[ozbob]

How is this achievable without addressing the system as a whole?  Shorter sections??

[somebody]

Not very achievable.  Major limitation is rolling stock availability anyway.  I guess once NGR come on board, that will change.

I understand the trial in Sydney has seen a reduction in capacity.

[BrizCommuter]

Bowen Hills and Fortitude Valley (plat 2/down sub) both require improved signalling for when sectorization goes pair shaped.

At Bowen Hills - trains cannot approach platform 2 if a train is crossing between the suburban and mains (or vice versa) to the north of the station. Multiple home signals, or signals allowing a limited speed approach would help here. 

At Fortitude Valley - trains cannot approach platform 2 behind a train that has just used the crossovers from the down sub to down main until the points have normalised. This creates platform re-occupation times of excess of 2 minutes. Multiple home signals, or signals allowing a limited speed approach would help here.

For when sectorization is normal, the subs have pretty poor signalling anyway, with platform re-occupation times (RORI) around 90 secs. Multiple home signals on approach to core network stations would help solve this, particularly at stations with longer dwell times such as Bowen Hills (in particular up sub/plat 1).

[somebody]

At Bowen Hills - trains cannot approach platform 2 if a train is crossing between the suburban and mains (or vice versa) to the north of the station. Multiple home signals, or signals allowing a limited speed approach would help here. 

Does this apply for the crossovers north of the Ferny Grove flyover, or only the ones to the south?

[BrizCommuter]

At Bowen Hills - trains cannot approach platform 2 if a train is crossing between the suburban and mains (or vice versa) to the north of the station. Multiple home signals, or signals allowing a limited speed approach would help here. 

Does this apply for the crossovers north of the Ferny Grove flyover, or only the ones to the south?

Crossovers South of the flyover, between Bowen Hills platforms and the junction between subs and FG Line.

[somebody]

The ones to the south of the flyover only make sense to use when there is some sort of interruption.

[BrizCommuter]

The ones to the south of the flyover only make sense to use when there is some sort of interruption.

Yes, but when the crossovers at Fortitude Valley and Bowen Hills have to be used, it kills track capacity even further.

[Golliwog]

The ones to the south of the flyover only make sense to use when there is some sort of interruption.

Design and build for the probable worst case, not just for the preferred one.