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.