With regard to passenger lists in the 19th Century, you should also consider lists from Ireland to Canada via the Port of New York. My 2x great-grandparents Frederick O’Brien/Mary Weber O’Brien were married in Dublin in July 1844, travelled to Liverpool and sailed from there to New York, arriving in late August 1844. From New York, the route to Canada was north up the Hudson River to the Erie Canal, part way along the Canal and working one’s way north overland, possibly by railway, to Oswego then by ship across Lake Ontario to Toronto, and onward from there. I have been told it was quite common to sail from Liverpool in those days. Using this theory, I found the arrival date of my 2x great-grandparents in New York on August 29, 1844 as well as the name of the ship.