> It looks practically photorealistic.

what has improved a lot recently is the physically based rendering - specifically, the lighting. Looking at the steam page, this train game has that type of lighting.

Another game that uses similarly realistic lighting is https://store.steampowered.com/app/2406770/Bodycam/

Not to dismiss the effort by dev, but all Unreal engine games look photoreal these days. My point is that photorealism does not show effort these days.