I've picked up the Chinese edition of TS to get the two China routes included, and the high-speed included runs atrociously. I'm using Steam Deck and most other routes run perfectly well, some far better than I'd dreamed of, but Guiguang High Speed Railway: Guilin - Hezhou runs terribly - at most I can get 20 fps turning everything down low with no post-processing apart. Before I pick up another route - I'm looking at probably South West China High Speed (although heading over the sea, I'm tempted by the Tohoku pack), can anyone give any pointers on whether it runs better than Guilin-Hezhou? Thanks.
Its official status is 'unsupported' but it may just not have been tested yet. It works fine as long as it is installed to an external drive.
How do the other routes perform? If it's a general issue it's something to do with the Steam Deck, which TS does not support and there are many reports of it not working on it at all.
For as long as you install it in not the default Steam library, but either on an SD card or in a separate library somewhere else, and use GE Proton, it will work fine. However you'll need to get used to playing it in lower screen resolution (even when Deck is connected to a monitor). The "not supported" conclusion is probably because when it's installed in the default location, scenarios don't load, and under standard versions of Proton included with Steam client you get OOM in both 32-bit & 64-bit, sometimes already right after getting in the main menu.
It varies route to route. I picked up the South West China High Speed and it runs really well. The Steam Deck struggles with the very built-up routes like Birmingham Cross City, but runs others well. It does the job well enough for me to get my TS fix.
Then again so does everything. TS is highly unoptimised but Cross City has a habit of performing terribly.
Some routes are just slow unless you have a fast machine. With TS single core CPU performance is just as important as GPU performance. In some situations, it's more important actually, so I'm not surprised the Steam Deck struggles with more detailed routes.