It could also be that your GPU is flaky and the extra work by Trainz is causing the GPU to fail. I've seen this behavior before with both ancient video cards and modern ones alike. In the olden days we would heat the circuits with a heat gun to force a failure with marginal components when a report came in that the graphics was flaky. Sure enough, something was bad and one of the chips was marginal when warm.
I would contact support and have your laptop looked at. I've seen this before many times as a tech and not long ago with an older EVGA video card that I was able to replace at the time under warranty.
You may want to install or check hardware monitoring software. ASUS has one for their hardware but if they don't you can always use MSI Afterburner.
MSI Afterburner is the world’s most recognized and widely used graphics card overclocking utility. It provides detailed overview of your hardware and comes with some additional features like customizing fan profiles, benchmarking and video recording.
us.msi.com