I think that Springfield will probably be the western terminus of frequent intra-state passenger rail service in Massachusetts. Springfield is the Commonwealth's third largest city. The first thing that needs to be done is put back the second track east of Springfield and west of Worcester and add a few universal crossovers. I cannot remember the number of miles, but it's in the area of 35 to 40 miles, give or take. MassDot has had that on their radar, but it seems not to be a very big blip.
Once you have the cooperation of CSX [quite a big "if"], and the double track, more frequencies can be put into the schedule for commuters, Amtrak can run the Inland Route if it desires, and the planned service between Boston and Montreal can begin when there is equipment available.
Going west from Springfield, there are only two towns between it and Pittsfield: Westfield, and Chester. But you have the long, slow climb over the Berkshires, and that could be the show stopper for any relatively quick passenger rail service between Pittsfield and Springfield. Some have suggested a bus connection, and at least now, I agree with that.
From the article: “Pittsfield doesn’t have any facilities for a train,” said Turon. It appears, Mr. Turon is unfamiliar with Pittfield. There is a small yard to the east of the station, and there is just about nothing in it. Train equipment could be stored there, with the nod from CSX, of course.