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Possibly the largest animal, and troll, ever to live. The Broome titanosaur is an ichnogenus of huge sauropod tracks from the sandstone of early Cretaceous Broome, Australia. The pes prints measure a staggering 1.5-1.7 meters long, and appear to be relatively undistorted. Compared to the ~90cm long pes of Giraffititan the animal that made such prints may have measured 40-45 meters in length and 120-200 tons in weight. Obviously these measurements are sketchy and imprecise, though the prints do suggest an animal larger than any other currently known.
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Not that I know of, although I did some digging and cross-scaling of A. altus from Cope's old sauropod papers. It appears altus was indeed a decent bit larger than Diplodocus c. It looks to be ~30-31 meters long and about 4.4 meters tall at the back, probably around 15 metric tons. If Amphicoelias fragillimus was a scaled up version it was 2.7/1.05=2.57 as long, or just about 80 meters long and 225-250 tons.