Out of curiosity as a Series X owner, I've been wondering would Xbox Series X and PS5 handle Train Simulator Classic. Just curious.
It is Impossible, no matter how power these consoles become. TS Classic is a PC game that runs on a PC only engine that will stay a PC exclusive.
It uses a proprietary 32-bit engine dating back to railworks which could in theory be ported to consoles, especially moreso nowadays than with prior generations of console hardware which tended to be more bespoke, whereas now the console market has standardised to the same architecture home PCs use. But it'd be a major investment of work and money to do so. Not only in ensuring everything is running properly but also in setting up a custom designed console UI. And it'd likely initially be extremely buggy and require a lot of work to make it compatible. Now if this were all to be done, it'd probably run pretty damn smooth. It's a product that's over a decade old from a time when PCs had considerably less hardware clout than the current gen of consoles. But the work it would take and the cost of that work would absolutely not be worth it when they already have the TSW2 development pipeline in place.
TSC is based on DirectX 9 (with some other bits tacked on) and DX9 isn't supported on any "recent" consoles, so nope