The route is just too winding for those speeds in so many places and you end up going 60MPH for much of the trip.
The best views going north are past the Connecticut river, rolling through Niantic, to New London and the small coastal villages like Mystic, and heading south the rail bridge that runs next to the Triborough gives you a fantastic panorama of Manhattan's east side.
I love the train.
Never heard about having dedicated rails. It would be nice, since the FRC requires any train that travels on track shared by freight to be basically built like a tank, which makes them much more expensive to make an operate.
For anyone else interested, that's the Hell Gate Bridge[0]. It's odd, I'm in the generation that will always think of the Triborough as the Triborough, not the RFK, the same way others still think Interboro, not Jackie Robinson.
And a big advantage of rail is that the trains can just run on conventional track and progressively go faster while portions of the track are converted to high-speed, while maglev needs a complete run of maglev track before it starts being usable.
A closely sitting and smooth train wheel gets damaged pretty quickly traveling on track that is accustomed to freight traffic. That now-damaged wheel then goes on to damage the polished high speed track, which then further damages other trains' wheels in a vicious circle.
China's new high speed train network, for example, is almost all dedicated track (a large part newly constructed routes) with existing track used only where there are space constraints (for example, a city centre station).