Photos are at this link : https://flic.kr/s/aHsms4xTgy
Everything seems to be intact, though Level crossings are slowly being obliterated and undergrowth hides the rails at most places between Pinnaroo and the Border.
I wanted to have a look at just where the SG and BG ended at the AWB site (it's about 100m past where the Quarantine Station is on the adjacent highway) but a strong barbed wire fence and the thought of what could be lurking in the long grass (it was quite a warm day) held me back. From the small parts that I could see, it appears to have been DG, with the BG ending just before the eastern AWB loop points, and the SG ending about 100m east of the loop points - the tell tale being warning signs advising 25m to end of SG or BG as the case may be. Any Grain loaded onto a BG train there would have had to have been via portable loaders.
The 20km BG line eastwards is intact (including the grain loops at Panitya and Carina) and relatively free of growth, though the condition looks rather poor.
The now isolated BG ends at an earth mound on the eastern side of the Mallee Highway Level Crossing just before Murrayville - adjacent to the 582km marker post - beyond there is now SG.