Yeah train wifi is generally terrible. Basically the only real solution is 100% 5G coverage along all train tracks or starlink. This is basically a global issue because line-of-sight for trains is a hard problem.

It's really hard, because anything gets confounded by tunnels unless you have specific repeaters for them, or the train is longer than the tunnel.

That's usually what I've seen done in Europe or even in Japan

Sure appears that way. Wish they used Starlink. 5G cuts out at high speeds.

I've used some of those WiFi services at near 200mph, so I guess it'll depend on the 5G, LTE or HSPA frequencies it connects to. They're never great, though, although I guess that's also related to tunnels and the quantity of people aboard.