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I assume you are referring to the Avelia Libery[1] the replacement for the acela express. Unfortunately until track and signal upgrades happen (no date on when they will happen) the train is limited to 160mph. It's better than acela but not much.

[1] https://en.wikipedia.org/wiki/Avelia_Liberty

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Does this have in-cab signalling? Britain built 140 mph capable trains, but experience showed the existing 125 mph was the maximum at which a human looking out of a window at coloured light signals is truly effective and so they're operated at only 125 mph.

(Trains on High Speed 1 from London to the Channel have signals displayed inside the cab like a TGV so it's safe to go faster)

The UK is actually unusual insofar as we allow trains as fast as 125mph (201km/h) without in-cab signalling; most other places in Europe require in-cab signalling at lower speeds (some as low as half of that!).

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