Re: Buses are like HS2
You've clearly never actually tried to use the WiFi or mobile signal on a UK train - put simply, they don't work.
Aside from that, most of the time it wouldn't matter if they did because you can't get a seat with enough space to open your laptop.
I regularly try to work on the train while travelling to or from a customer's site, and about half the time I don't get anything done and have to catch up the work late in my hotel room, instead of supping at the bar as nature intended.
If the train was half an hour quicker then that would be either half an hour longer in the office/in bed before setting off, or half an hour longer in the hotel bar.