Chicago to both Detroit and Saint Clair, with Canadian National continuing on from St. Clair to Toronto and further east, was Grand Trunk Western, a USA railroad owned by Canadian National.
Grand Trunk was also a USA railroad owned by Canadian National, running from south of Montreal to Portland, Maine.
They often swapped equipment, ditto with another USA railroad owned by Canadian National, the Central Vermont, from again south of Montreal to New London, Connecticut, with connection there to both the New Haven and its own steamship line to New York City. The steamship line was discontinued when war commenced in 1939.
In the 1970’s I not only enjoyed steam excursions out of Detroit on the Grand Trunk Western, but also served as a car-host crew-member for steam trips out of New London on the Central Vermont run by Branford Electric Ry. Assoc. The latter usually had Grand Trunk coaches with a Grand Trunk Western or Canadian National steam locomotive, usually a 4-8-4.
The Mowhawk was the Grand Trunk Western’s answer to the Perlman degrading of the New York Central’s Chicago - Detroit service, with a competitive running time, despite the longer rout via Durand, and a very good dining car.
The last Grand Trunk pasenger service was Friday and Sunday afternoon-evening coach and parlor Portland - Montreal service. No diner, but parlor-car passengers could by sandwiches and hot tea and coffee and cold drinks, possibly wine and beer but unsure of that. This also provided the last Boston - Montreal service after the Alouette CP & B&M two-car RDC train was finally dropped. One could ride the 1pm B&M Budd RDC train to Portland. taxi to the Grand Trunk station and ride its Friday evening train to Montreal. Interestingly, the Grand Trunk parlor car carried the name Alouette!
Of course, the flagship of the Grand Trunk Western was the International Limited, Chicago - Toronto, coaches, sleepers, diner, and lounge. F