You have to create your own livery in livery creator and then use it on the route*. There is also a trophy where you create a scenario using your own livery as well. * The PS5 version is bugged as I was using TrainSim-Adam 's Intercity Liveried Class 395 and after I arrived at Ashford I got the trophy awarded lol. Regards Hentis
I’m having the same problem. I also can’t work out how to use my created livery on my created scenario.