You surely mean 10 trains in each direction?
McNeil has been guilty of bait-and-switch. I was at those PICs and packed church gatherings. GO was not promising hourly service in each direction to Brampton, they were promising a slight improvement over the lousy less-than-hourly service Brampton, er, Bramalea was getting before next week's cutbacks.
Even 10 more trains in each direction doesn't quite mean all-day, two way service.
Right now, there are 10 departures from Bramalea: an early morning run, the 4 through trains from Georgetown, one peak local train, one later morning run (was 9:05, now 9:20), and 3 trains running every 90-120 minutes apart.
So 20 trains could be "hourly service" from 5:30 AM to 12:30 AM, but that does not count the rush hour trains, so add 3 peak extra trains. So maybe you've got service from 5:30 to 21:30 now, a train every hour, with peak half-hourly service. Still, that assumes no increase in peak hour demands. Let's add 3 more trains for 20 minute rush hour service.
That's 23 trains, or 46 in-service trips, and a conservative figure. That's more than McNeil was promising opening day.
Below, McNeil was talking trips, not trains, not round trips. He's typical of old, "Cabbagehead" GO.
Metrolinx, at least, seems to have a more progressive mindset than the old GO crowd. 59 trains a day, or 29 one way, 30 the other, is certainly hourly service all day, with considerable peak improvements as well.