I think that the Main South area is still pretty rough..and some areas in Lincoln St / Lower Burncoat / Vernon Hill.
Kind of sounds like a good incentive for moving! I remember having a train yard behind my apartment in Framingham years ago, and the vibrations from the trains felt like heart palpitations. That being said, it was pretty wild to watch them use something that looked like a jet engine to clear snow from the tracks. But yeah, there are a lot of sharky real estate investors, and all it takes is a few other neighbors to sell to them to really change a neighborhood, for better or worse. Being right near the commuter rail, probably a larger residential or mixed use building.