Internet on Trains

[Lumiere]

Would that even be possible on a tilting, shifting, vibrating train doing 125 through trees and tunnels?

Well, it is possible on a tilting, shifting and vibrating Boeing 747 doing 485 mph ..

GSM does not normally work in tunnels too ?

[VectraMan]

I thought they were doing it with WiMax between posts alongside the tracks. I read somewhere the original Virgin system used a combination of wiMax, satellite, and regular WiFi in the stations. They probably also now use 3G as a fallback.

But I might be wrong.