mycalpal
Train Attendant
I can tell you that Boston's South Station is open 24 hours and when traveling up to Maine I usually stay with friends in Boston, however on a couple of occasions I took the Silver line from South Station out to Logan Airport and spent a few hours overnight there. The trip back in to South Station on the Silver Line is actually free. It is cleaner and safer and has better seating than South Station. While this is not an option I would recommend, having arrived into Boston as late as 2:30am on the Lake Shore Limited, I can't see spending easily $250-300 on a hotel room in Boston for a few hours. Good Luck!