I've noticed a flickering texture on the driver's cab of the GP-40 locomotive. More precisely, the identification number flickers as you zoom in/out or while passing by. May be there is an overlay with another texture...
in the tunnels i cant remember witch train i drive because i just gonna play the game when the trophies are fixed appears in windows flickering and where are people the heads appear flickering, somekind of mosaic, that kind of image when you want not to see your face they put the image of your face with blur.
...of course there are still a few bugs left, but all in all TSW is the best (looking) train simulator on the market! I think they also could increase some texture details on the locomotives, because on the PS4 you can still see some pixel artefacts as a matter of too low resolution.