This is interesting.. Because since BO-1 is the only "Guilford/PanAm" local in the Boston area, we can't forget CSX as well. Remember across the river a bit, you have the Beacon Park CSX Yard, that is very active.
It's funny, since I was commuting to Boston 2 days a week since late September I used to see BO-1 sitting at it's parking spot across from BET at times they'd look to be ready to go at 6:30/7:00AM. I only caught them moving a select few times. I do hope that in any way their is some still lingering freight activity on the "North Side" it would be nice to still see
I have also seen at times BO-1 up in Lawrence as LA-1 and as well up in Lowell as LO-1, so it never seems to amaze me where the traffic will pop up these days