Canada's land mass is slightly bigger then the USA, maybe you should narrow it down a bit.
Start here http://outdoors.ca/en-CA/Articles/BackpackingInCanada.aspx
Then you're better off with Google instead of a video game website...
I did the Eurorail thing twice when I was in my 20's. Travel light and make sure your backpack fits comfortably. A mosquito net is your best friend for sleeping outdoors.







