15 minute timetable (transitional)

[#Metro]

I've had a look through the timetable threads over the past years.
Taking everything into account, it might be possible to run a transitional 15 minutes timetable
, while commuters wait for capacity increasing measures such as the CRR tunnel, various line extensions and duplications
to allow the UrbanLink/ExpressLink system to begin.

These are just suggestions, but input is needed for the Beenleigh line/Gold Coast Line (could Tennyson be used there?)

15 minutes off-peak

5 am - 10 pm, with services every 20 minutes thereafter.
20 minutes minimum all lines for the weekend 5am-10 pm (except Doomben/Rosewood).

* Ferny Grove Line: 15 minutes to Ferny Grove, all stations, OFF PEAK
* Cleveland Line 15 minutes to Manly, OFF PEAK
* Shorncliffe Line 15 minutes to Shorncliffe, OFF PEAK
* Ipswich-Caboolture line Is already 15 minutes to Corinda, no change???

There are a few questions:
Should the Doomben line be BUZ-tituted in the off peak to a bus every 15 minutes to allow the Shorncliffe and Cleveland Lines to be paired?

How far down the Beenleigh line is 15 minute frequency possible?

Should the Tennyson Loop be used in this?

[#Metro]

A high frequency feeder bus network to trains can be developed.
This raises the issue of "what happens during peak hour" when lines become crowded and allegedly
there is no more space to fit extra passengers on rail.

One potential option would be to run feeder buses to rail stations during the off peak. During the peak hour, the feeder route would run but would convert into a direct express bus. This is little different to what happens on all-day bus routes currently anyway- the all day routes continue to be run, but are supplemented during peak hour only with rockets and expresses. The same thing could be done for rail until platforms could be extended and 9 car trains could be put on.

For example's sake only, imagine a route 800 is a bus that feeds a rail station every 15 minutes.
During peak hour, surge capacity is required, so 801 Express buses are slotted into the gaps of the 15 minute timetable
which go direct to the CBD. OR alternatively, all 800 buses are replaced with 801 express buses direct to the CBD.

This system could be kept in place until capacity was expanded (2 min signalling, platform extension, 9 car trains) to take the extra load from the bus system. By doing it this way, 15 minute off peak patronage on the rail system can be supported, and a direct trip to the CBD can also be supported when peak hour patronage fills the rail service.

9 car trains...

(3 trains x 458 passengers/unit) x 30 trains per hour = 41 220 ppdph, which would seem
more than enough capacity for Brisbane during peak hour to handle peak hour feeder bus pax.