Given the required headway in the long run I expect all trains would run all stations from Boggo Road to Yeerongpilly in the AM counterpeak, and all trains would run all stations from Yeerongpilly to Boggo Road in the PM counterpeak (including Gold Coast trains). Beenleigh trains are currently timetabled to do Boggo Road to Yeerongpilly in 8 minutes (2 minutes for each station). Assuming about the same travel time from Boggo Road underground vs surface to Dutton Park, you would be adding a few minutes to Gold Coast trains, as would adding Hope Island and Merrimac, but you would be picking up time overall on a trip from the CBD to Varsity Lakes due to the combination of:
- ETCS Level 2 roll out for the entire length of CRR and south to Varsity Lakes, allowing closer separation between higher numbers of trains and so better acceleration / deceleration and higher speed limits than the current lineside signalling allows.
- Faster trip to the CBD (Albert St) via CRR compared with Central / Roma Street via the Merivale.
- LGCFR allowing uninterrupted express running from Kuraby to Beenleigh (and facilitating a better timetable for express running on the third track from Dutton Park to Kuraby).
- Eventually - future amplification between Kuraby and Yeerongpilly. There is adequate room for a fourth track, and I doubt we are getting any sort of whizzbang bypass tunnel much as we’d like it.