Ok, I will cross the border to the remains of the old South Coast line and say it is the old pylon of a bridge about West Burleigh. I thought that wooden trestles were mostly used there but perhaps larger streams may have used such early style pylons.
Well then Raymond, seeing as though Bundaburg is the only big city between Gladstone and Maryborough I will say it is part of an old alignment over the Yellow Waterholes Creek on the south edge of that city.