There is no room in Worcester now with existing traffic, and its not really triple track west of the Worcester yard. It's a controlled siding and main 1&2. to CP46 then main 1&2 to CP48. After that it is single main. The controlled siding is only a bit over a mile long and is used for intermodal car storage during peak season. You can fit maybe, if one of them is small, three trains on main 1 between CP45 and CP48, but it doesn't really matter as the RR is effectively single track from CP45 to CP57 when you do this. Post merger there is no way the current operations will work. Q115 is already dropping excess tonnage out of Worcester in West Springfield.
They are going to have to bring back at least one of the recently abolished trains, Q423 or Q437. My guess is Q437, the train the local job handles since the start of Covid last year. There is no local that goes Worcester to Ayer. That was abolished last year as well. The road crews deal with bringing Q426/Q427 up and down the branch now if they have time or the yard crew does it. They get parked on the branch for crew both ways. Q426 at Burncoat for Pan Am to Ayer, Q427 at New Bond to CSX to either sit in Worcester if the yard crew does it or to Selkirk if it's the road crew.