I would assume so. I was on the Amtrak Maple Leaf train yesterday for a day trip to Niagara Falls. It was only about 60% occupied by the looks of it and more than 3/4 of the people on it got off in NF, ON. Out of the 4 cars, 1 was closed, 1 is half business / cafe car, and two were economy. This was middle of summer and tourist season. There were a lot of British tourists on as well as families like mine on a day trip. I did see a lot of what looked like American tourists heading back home and ready to board in NF, ON to go to the US. It seems that the Maple Leaf service serves as a market for NF tourists and a milk run for upstate NY. My guess is that given the long trip times there are few to no passengers that actually go Toronto-New York. It’s cheaper and more comfortable to fly than take a gruelling 12hr train ride.