CP mainline with ac44's for the high speed freight, older cp locos (sd-40, gp-38, refurbished gp-9/gp-30eco) for local/switching jobs and maybe old Via Budd cars for the passenger service, Ai only services in the Huron Central yard, plenty of industry for local/yard jobs. Would be cool to have another Canadian route! (maybe some KCS/CN locos as layers(or a whole new CN loco (hinting towards maybe a Canadian comfort cab of sorts ))) Also as a footnote, maybe you could even add some Vale Services (ex INCO) for their trains going from the mines in the area to Clarabelle Mill, where there is a really cool rotary dumper.
Second footnote lol, if you include the branch to levack you could have some really nice coal drag style trains.