I think that the Fairmount Line would be a good addition to the MBTA routes, considering 2 parts of the route will already be in the game, that being South Station, and Readville. This route would have the same equipment as the upcoming Framingham/Worcester line, and the route is not that long. It makes the stops listed below: South Station Newmarket Uphams Corner Four Corners/Geneva Talbot Avenue Morton Street Blue Hill Avenue Fairmount Readville. Like I said, I think that this route would be a good addition, it's simple enough, and it would be cool to see some more routes centered around the MBTA, seeing as the Framingham/Worcester line is the first time the MBTA has gotten some attention by dovetail since the Providence/Stoughton line release back in Train Sim World 2.
That'll be nice but the route is too short for its separate route. Maybe it'll be featured in a Providence/Stoughton update