I took a stroll through the revised Bus Network Redesign and looked at the Txx series of routes and their frequencies. Most of them are 8 min peak/11 min off-peak, with lower frequencies in later evening and early morning.
But there are a handful of routes which see higher frequencies:
| Route | Peak Freq | Off-Peak Freq | Corridor |
|---|---|---|---|
| T1 | 7 min | 9 min | Mass Ave |
| T23 | 8 min | 9 min | Ashmont-Ruggles |
| T28 | 8 min | 8 min | Mattapan-Kenmore |
| T32 | 6 min | 8 min | Hyde Park |
| T57 | 6 min | 9 min | A Line |
| T66 | 8 min | 10 min | Brookline Crosstown |
| T111 | 5 min | 9 min | Chelsea |
| T116 | 8 min | 9 min | Revere Broadway |
No surprises here, all were previously all-day high-freq services (map from 2020):
The only mild surprise is that the T31 didn’t join this club, “only” getting 8 min peak/11 mean off-peak — which is still turn-up-and-go, and I’m guessing was mild trade-off to provide the same frequencies across the entire Txx network.
Which is itself notable: this is advertised as 15-min-all-day-all-week, which it is, but during peak hours and the midday off-peak, I believe the entire network is 8-min-or-better at peak and 11-min-or-better off-peak, which really is something.