Went past the Park Terrace construction site today and they are obviously about to start driving piles and digging the trench next to the existing line; there was a lot of construction materials being moved onto the sites adjacent.I think you will find that the railway lines at Bowden are going to be deviated through the section of land formerly used as factories and now all demolished, and alongside the sports ground that is across from it as they have a nice level area now to lay track onto there! As not only is this area had some rail delivered into it it sits in what was formerly the road behind the station platform now removed, if you have a look there. Also the Northline deviation into the Golf Course is coming along as well getting all nicely leveled off on Thursday as I went past.
Also out of interest the Advertiser had an article yesterday stating that the government's next stage of the South Road project would be Regency Road to Pym Street, meaning that traffic will be able to travel from Gawler/the Barrossa to just beyond Grange Road completely traffic light free (sometime around 2021/2 but nevertheless it's on its way).
Once both lines are deviated out of the way work should begin in earnest on digging out the trench at this location and keeping metro trains running for as long as possible without interruptions to services on both lines. There will have to be a closure though in the end to reconnect the new trackage to the old trackage but I think Adelaide Metro is keeping shutdowns on this project to a minimum though as even for a couple of days there is an outcry about shutdowns from some.