Via Rail has fully built out the Windsor, Ont., to Quebec City, Que. line: The service is a significant upgrade from its previous offering, with greater rates of speed and great reliability. Their next move, with the entire corridor covered, it to add on-board media services that would allow you to watch movies on your laptop from a server, or play on screens in trains while being distributed via Wi-Fi among cars.
The Via operator also expects to extend service through Canada, using store-and-forward proxies for periods in which trains would be out of reach of the cellular networks the service relies on. Queued email would be sent when the train arrives at a station, for instance.
I wrote about train-Fi for the Economist back in September. There are a number of large-scale trials that I'm waiting to hear more news about, and will be writing about soon.