It does not, which sucks, but that's not Apple's fault- It's the MBTA's fault.
Here is the link to google's list of what public transportation systems are covered by their system. (international too)
http://maps.google.com/transit
As you can see, Boston is missing.
They do have:
* Cape Cod, MA (Cape Cod Regional Transit Authority)
* Lexington, MA (Lexpress)
* Framingham, MA (MetroWest Regional Transit Authority)
* Pioneer Valley, MA (PVTA)
What really annoys me is that the opt-in is free, yet they still haven't done this.
I say we start calling them now!
-Nino
Send feedback here
http://www.mbta.com/customer_support/feedback/
I'm going to.