Not necessarily. Some trains could could be diverting from the west via the OVR at Sudbury to NB, although I do not know traffic patterns. There is no s/b Bala to n/b Newmarket connection at Washago. I would think if they are originating in Toronto there would be increased traffic on the Bala sub. Having said that, five trains is not a lot, although more than two which I think is the normal traffic on the Newmarket sub.
They are all coming from the MacMillian Yard.