Like House Zoning, Fare Zoning needs an update too.

I do see Wu's point too. You have subway trains that go pretty far outside the city. Route 128 stop in Westwood is Zone 2, so it's $7 one-way. A ~15 min drive up 128 takes you to Riverside in Newton where it's $2.40.

The Fairmount and Needham Lines should be part of the Subway system too but that's another discussion for another time.