Again, I have to chime in about the viability of running GO Trains on the OBRY line to Orangeville. It simply makes little sense. Getting a few peak-direction trains to Bolton (stopping at Woodbridge) makes far more sense in the short to medium term. I've been on the Credit Valley Explorer twice. It's a beautiful trip, especially in October. But it's slow, and Orangeville isn't that big of a place, with its out-of-town commuters headed to jobs in Brampton, Mississauga, Newmarket, Woodbridge and Toronto. The GO Train will be near empty all the way to Mayfield Road, where a stop there could intercept some commuters who might have boarded trains at Brampton or Mount Pleasant.
Even with upgrades, the grade from Cheltenham, up the Escarpment through Inglewood and Forks of Credit is slow and winding, much more than any other GO route apart from the underused Richmond Hill line south of York Mills Road. Highway 10 is usually free flowing into the 410 except in bad weather. Buses are fine, let's start running more of those, then perhaps look at a spur off the Kitchener Line to serve new stops at Bovaird Mayfield and King Street (by Brampton Airport) to intercept some commuters otherwise headed to Brampton or Mount Pleasant Stations.
