Alexander's Hetaroi
Deity
I'm not very familiar with Canadian history, but in a game that contains both England and Russia, having Canada as the civ that cares about railways would seem odd. Obviously it wouldn't be associated with Eleanor as the new leader, but they could conceivably adjust the existing abilities for either England or Russia to care about railways.
Finally, England, the U.S., and Russia are already in the game. Maybe no civ gets special railway mechanics. Or maybe they tie it to one of the other civs, somehow. But if Firaxis is looking for someone to tie special railway mechanics to, there's a lot of Canadian history that could be drawn on to build a story around.
I don't know if any Civ is going to specifically get any railroad mechanics explicitly but I expect both England and Russia to have some of their mechanics working in with railroads. England's new UA has the ability to accumulate coal faster, which presumably might have something to do with railroads.
As for Russia I believe that railroads will act like industrial era traders and could go in hand with Peter's ability about sending trade routes to other Civs. Then there's his achievement Trans Siberian Railroad.
As for America I'm honestly predicting Teddy might get something towards canals.