Apparently, Amtraks' web site fails to show any alerts for 448/449 after the trackwork supposed to be completed this past Thursday. Aparently, the left hand doesn't know WHEN it will be completed as last Thursdays' end date was actually an extension from the previous week, if I recall correctly.
BUT...just for kicks, I went to Amtrak.com and found that 448 is bused Monday and Tuesday. I didn't look any further. So, if things go this week like the previous week, #449 from BOS runs today, but no #448 to BOS today through Thursday, inclusive. However, I'm guessing that it's one day at a time. Maybe they ran a day or two longer than expected and only need a couple more days. In my best 'Dirty Harry' imitation: "Do you feel lucky?" (at least for this week)