Microsoft Train Simulator (abbreviated to MSTS) is a train simulator for Microsoft Windows, released in July 2001 and developed by UK-based Kuju Entertainment.
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Frustratingly this old heap of junk has the longest and highest quality routes out of any simulator to this day. While the graphics and physics of newer simulators get better and better, the routes only become shorter with each passing release. If you want to run a high speed train uninterupted for 200km, you need to go back to 2001.