I don’t mind grit and dirt — I might have been happier in the corrupt NYC of the 1970s.
DC-Boston could be sped up significantly in 4 years if they wanted to. Build a parallel set of tunnels to NYC from NJ, which would allow more trains to pass. Run some express trains between DC and Boston, with only a few stops. DC, Philly, Newark, NYC, New Haven, Boston come to mind, with none of the podunks in between. Get rid of the 30-minute stop in NYC, which has no good reason for existing.
The US doesn’t need high-speed rail. It needs highER speed rail not run in a retarded fashion.