This is a bug which has been in Train Simulator a long time. If you are sat stopped for a couple of minutes and another AI train comes past it...
Interesting regarding MSI afterburner reporting DX9. I tried the Nvidia performance overlay from GeForce experience and both the FPS and 99% FPS...
Same 15 fps, on a scenario where I see 40 - 50 fps using the normal 64 bit version
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