@JessTheUnstill @geekysteven It's also easier to work on the train than on a plane.
One reason high speed rail was initiated in the UK was because back then it was hard to do work on trains, so getting there fast was what business travellers needed. (And we don't do a lot of in-country business travel by air in the UK.) But now with laptops, mobile phones and WiFi on the train, business people can get work done pretty easily. So speed is less of a factor, but reliability still is.