There is tons of capacity on the line and with the signalling system the way it is. The only place where there will be conflicts is at Strachan/Bathurst, and even that can be quite easily mitigated with smart dispatching and a wee bit of planning.
I suspect that the reason why they need to cut back the UPX to half-hourly is because GO does not have enough crews trained on the Galt and Canpa Subs, and thus those crews will need to have pilots which do know those territories. As well, the VIA trains to Windsor will also need pilots for this same reason.
Dan
Toronto, Ont.