Wi-Fi access on Trains is a good idea, I'm sure there are plenty of people who would take the opportunity to use the time on the train to get some work done (I do already via GSM). The problem is that on many trains (normally the ones I use) there are no seats available, let alone seats with a table and some space to work. Trains are also too expensive for people who have the choice of how to travel, my frequent trips from Bicester to Crewe are faster, cheaper, more comfortable and more flexible than using the Train.

Lower the prices, make the trains longer and I'll use the train much more often than I do at present.