It's my understanding that there is simply no more slots to run extra trains.
Is it time to investigate morning peak hour bus services direct to Central from the likes of Petersham, Stanmore, Newtown and MacDonaldtown if safety is an issue? Even Stanmore -> Newtown -> Erkinsville -> Redfern, then jump on an existing service from Redfern to the CBD.
What would be the logistics of using the turnback at Ashfield for perhaps one or two services in the morning peak? Could they achieve that?
Or is it just not possible without upsetting the rest of the western timetable?
I sympathise with the people in this story, but really, myself personally, I simply travel outside peak to avoid this.
It was a bit better after the 2013 timetable changes, but obviously becoming an issue again.