Product Compatiblity
(Excluding products that are compatible with Trainz Simulator or Microsoft Train Simulator, RailWorks only)
As long as you have the European Loco and US Loco (Included in TS2012 and all previous versions) asset packs that you can purchase from Steam Store (links below) and any requirements listed on the product page, it will work on TS2018.
US Loco & Asset Pack: http://store.steampowered.com/app/208306/?snr=1_7_7_151_150_1
European Loco & Asset Pack: http://store.steampowered.com/app/208300/?snr=1_7_7_151_150_1