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#11
Looking at userbenchmark.com, a single RX580 is approximately equivalent to a GTX 1060. It is much superior to 1050ti. I don't know how much gain is achieved by two RX580s in Crossfire. (As regards VRAM, if Crossfire is like nVidia's SLI, the effective RAM is that of a single card; duplicate textures are loaded onto each card.)
That's one seriously resource-hungry game. So much for the claimed system requirements: Trainz: A New Era system requirements | Can I Run Trainz: A New Era