I have installed all the mods, which you say you must have. (To be able to use this mod.) But I can not find the pillars anywhere, on the Steam Workshop. Are they removed from Steam Workshop? They are not in Content Manager-> Assets. I have downloaded everything, again. It's a little sad to have to see floating Metro tracks. The strange thing is that there is the same problem with vanilla Metro bridge tracks. I do not know if there is anything wrong with my Cities: Skyliens. Or with this mod. (I have not tried uninstalling this mod and just test the normal vanilla tracks. In vanilla Cities: Skylines. But I are gonna try that.)
Btw: I've tried to just use your mod, almost. I have installed a little something else as well. (I tested it on: Cities: Skylines --noworkshop. So do not think about the ones I have in my Mods & Assets library.)
But I will try to only use the mods that you say you need.
(When i say i are gonna try or test, a are gonna do that when I have time and want!)