Migration routes from Canada to Chicago

Except for a brief reference on the web, and reference to in a journal on this web site, I have not found much on the specifics of getting from Quebec to places in the midwest, such as Chicago. I would like to know the following: 1. What passenger ports on the southeastern shore of Lake Huron (southwest Ontario) would immigrants have departed from to get to Chicago between 1875 and 1890? I have found one reference that indicated immigrants may have taken a train (line?) from Toronto to Collingwood, and then taken a passenger steamer up Lake Huron and down Lake Michigan to Chicago. No specifics are given. Were there other ports in southwest Ontario? A journal on this web site talks about taking a train from Toronto to Sarnia and catching a passenger steamship there. 2, What passenger ships departed from southern Lake Huron ports (1875-1890) and how long did it take, and how much did it cost? 3. Would immigrants have taken the Chicago, Grand Trunk RR from Toronto all the way to Chicago, instead of taking a Great Lakes steamer, or was that more expensive? 4. Are there some routes other than those I mentioned? 5. Are there any Great Lakes Ship passenger records that still exist? I heard that it is not likely. Thanks. Jon