MassDOT's committed as part of the line buy to make a lot of state-of-repair upgrades to the Berkshire Line. Much like they're doing in Southeast Mass. as I.O.U.'s to the big CSX line sale. But it's not going to be instantaneous because the sale was too recent to hit a 4-year agency-wide Cap Improvements Plan budgeting window. The Mass Coastal lines feeding CSX interchange had their sale announced in 2008, took effect in 2011, and are just now getting new rail and ties dropped in advance for the '17 construction season kicking off a 3-year programmed funding blitz. "Upgrades" just don't get queued up overnight, and the Berkshire acquisition is still one CIP budgeting period outside of locked/loaded resources appearing on a programmed ledger.
As for what they're planning to spend...probably about as much as the original $18M sale agreement, since HRRC took a little off the top on price figuring it was more worth their while to take the offer of track fixes than get fined into oblivion by the FRA for safety violations. It's just enough IOU'd payback to make it reliably operable Class 1, clean out all the safety skeletons HRRC stuffed deep in the closet, and--most importantly for local commerce--get Berkshire Scenic back on its home rails without drama. But it's not, like, an "UPGRADE!"-upgrade because $20M will disappear real fast when diffused across an in-state corridor of that length...and all the disaster spots HRRC left behind on a corridor of that length. "Good solid Class 2" is probably a bit of a reach for the initial investment. Staying consistently upright with wheels firmly affixed to stick is more the type of life's little victories the state's first funding shot is aiming for.