[CityTech]

Didn't the city say they expected a 50 min travel time from Trim to Moodie?

From that I'm guesstimating Phase 2 travel times at:
-11 mins from Trim to Blair
-23 mins from Blair to Tunney's
-16 mins from Tunney's to Moodie
-13 mins from Tunney's to Baseline

If trains are branched Trim-Baseline and Blair-Moodie, that's means one branch is 47 minutes and the other is 39 minutes. If each one had 6 minute frequency that would combine to 3 minutes in the overlap.

47 minutes for Trim-Baseline @ 6 mins frequency = 17 trains required (47m+3m turnaround * 2 = 100 mins / 6 minute headway = 16.67, rounds up to 17)

39 minutes for Moodie-Blair @ 6 mins frequency = 14 trains required (39m + 3 m turnaround * 2 = 84 mins / 6 minute headway = 14).

So 3 minute headways on the central overlap part in Phase 2 will require 31 trainsets. We will have 36 trainsets, which is more than enough.

So it looks like they bought enough trains to hit 3 min in the trunk.