Well, it's not like they don't have train service which they do and is rarely used by Springfielders. Any sort of superelevation allowing significantly higher speeds on curves would probably play havoc with slower freights. Given that most of the slow sections are there for specific reasons (or are located where trains would be coming to a stop or leaving a stop anyway), I don't know how much they're likely to get improved. After that, the only extended slow section is while going through Chatham, NY which is full of sharp curves. The speed limit increases to 40 for the next several miles (and goes up to 50-60 after that), and then there's a long section of 35-45 MPH running as the line climbs to the summit of Washington Hill. The next slow section is a 30 MPH segment through downtown Springfield, which includes both the Springfield station stop and the bridge over the Connecticut River. There is one 25MPH section on the entire Boston Line - and it's just west of Worcester Union Station while trains are going through CP45. Even better if the times are right and they make them through regionals.

Except for a single LD the Massachusetts capitol has no service from its largest city. Any improvement to that would be more than a slight improvement! As would 2 extra frequencies. If I recall correctly there were some 25mph sections.

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