Amtrak is switching to faster 4G networks. Rebecca Greenfield isn't optimistic that it will do much good, noting that "the best commuters can hope for is very fast internet…very occasionally":
Currently, Amtrak gets its onboard Wi-Fi from Verizon and AT&T cell towers, which don't happen to sit along the train routes. Cellphone companies, of course, want to cater to dense areas of people — also known as their regular customers — and the way signals work, the further away the cell tower, the worse the reception. Although Amtrak will upgrade to faster, better cellphone technologies, changing to 4G doesn't make those cell towers get any closer to the tracks.
The Dish 