I don't know what the makeup of the Toronto - Windsor train is. The Ottawa - Toronto trains consist of 3, 5, or 7 cars and can be pulled by F40PHs or the newer Genesis units.
It would be interesting to know the routing of each trainset. For example, one set could start in Quebec in the morning and end up in Toronto (via Ottawa) in the evening. I know that some of the Montreal - Ottawa trains carry on as Ottawa - Toronto trains but I don't know that they go on to Windsor.
On the other hand, some of the Montreal - Ottawa and Toronto - Ottawa trains get wyed in Ottawa on the remains of the old CPR M&O junction which goes under Hwy 417 between the Innis Road and Walkey Road exits.