I had previously done a Google Maps search and found this: https://www.google.com.au/maps/@-33.9165863,150.7355267,739m/data=!3m1!1e3?hl=en
It had to be the station site – who else would make a sealed road into a paddock. I think it’s pretty obvious the U was where the staff cottages were.
Street View shows the old entry brickwork as was used at Doonside: https://www.google.com.au/maps/@-33.9167736,150.7304006,3a,24.9y,29.64h,93.36t/data=!3m6!1e1!3m4!1szHK703kDdJ1QL8nZjuR59g!2e0!7i13312!8i6656?hl=en
I stopped and took a few pics: