The eXpressway usually runs about half loaded when I see it (typically on Sundays). Frito-Lay is a large userYou do see the odd trailer moving on CN's Kingston Sub, typically on trains 148/149, but it is exceedingly rare. The eXpressway is pretty much the only train in Canada where one can see trailers on a train (other than some remote services offered by ONT and the former BCR).