As an ex-flight sim guy, I was intrigued, so I went to youtube is get some “perspective”.
This one:
https://youtu.be/Fj8h6yibHHcThere appear to be three modes for the scenery:
1 - standalone/offline content (low res - similar to what is in the previous version)
2 - cached content offline - flying over scenery offline you just flew over online and still cached locally
3 - full procedural generated scenery requiring a high speed internet connection and at least 16GB ram and the scenery is generated from bing data via Azure and streamed to you.
There’s more...watch the video. Probably not something usable for TS - meaning a lack of resolution enough on even a high end PC to generate the detail needed for rails, ties, ballast, weeds, etc, etc....
Not something I’d be into....