I'm sorry but that just look like building trains for just to have more trains. The Orange line is literally across the street. Granted, it feels far due to the size of Rutherford and the stations itself is set back from there, but it is still right there with less than 1000 FT.
Now if the Green Line goes into Charlestown, then that's expanding service.
Why not just move the Orange Line a 1,000 FT closer to civilization and run it underneath the updated Rutherford Ave. Heck, half the tunnels are already there.
- At the CC stop, install headhouses on both the BHCC and Thompson Square sides which would eliminate the need for pedestrians to cross the busy intersection.
- At the Sullivan Square stop, have headhouses on the Schrafft's side of the rotary and the bus terminal side so no one has to dodge rotary traffic. (And they could discontinue that silly Sullivan/Schrafft's shuttle.) If you wanted to get really fancy you could build a bus terminal in the middle of the rotary. That way the buses could enter and exit by simply merging into/out of the rotary traffic instead of waiting for traffic lights.
- Create a new City Square/Chelsea St./Navy Yard stop.
In the end, you even end up with a much straighter shot for the train between North Station and Assembly Square and almost everyone in Charlestown is a 10 min walk (or less) from an accessible Orange Line stop.