I'm back to taking the train after driving for a couple of months. It looks like the reliability issues have gotten a bit better since their alltime February/March lows, however there are still delays and they're still (apparently) being caused by signal failures. It looks like most of the major earthworks have been completed along the western line, and so from here on in things should be getting better.
One thing which has surprised me a lot over the past few days commute is that the trains seem noticably busier. I'd actually expected their use to maybe drop off a bit after the dire state of the line in February/March, but it seems that hasn't happened. Here's hoping that things continue to improve from hereon out.