Via Erik's Rail News. Way back in June 2005 I published this article to vent my frustrations at auto commuting between cities in the U.S. and my desire for an improved rail system in the U.S. One of the improvements I mentioned that I'd like to see was WiFi on the trains. This article dated Nov 2005, states that Canada's ViaRail system between Québec and Windsor is planning that very thing, though it's not clear if they'll charge for it.
On a somewhat related note, RAILnews.net doesn't appear to provide any RSS/Atom feeds for their news, what a shame...