MSTS doesn't have to work just the content you want to run. My suggestion is try Open Rails on the machine. I will admit that Run 8 looks really good though. Personally I have invested so much money in MSTS addons that I am so happy that we have OR that use what I have paid for over 15 years. And we all know what happened with MSTS2. Simmers hated the game aspect and there was not enough of a gaming aspect to keep gamers interested. Well they decided to make MS Flight instead and turned a lot of flight simmers off because Flight was a game and it flopped with simmers and gamers. MS had two good things going with simmers, MSTS 2 and the anticipation of Flight Sim whatever. Eventually MSTS will not run on any operating systems in the future. If your hard drive is big enough then you can partition it and install Windows 7 and still keep Windows 10. The frame rates are amazing and steady when verticle sync is put on. To me it is MSTS with the graphics that are about as good as whatever the newest version of TS is now. So I moved my MSTS folder over to my faster computer and don't even play MSTS anymore. Then I decided I liked the shadows, Changing the time of day within the sim and still have all my AI traffic, changing the weather in game and the cloud cover/fog. Then I Installed Open Rails and it kind of sucked on my MSTS Computer for frame rates.

I bought my new one specifically for FSX and for a long time I switched back and forth when I wanted to play MSTS. Yeah, I wasn't going to go buy another video card to run and old sim. I had the same sort of problem with Windows 8 with the Radeon Graphics card.

Msts on windows 10