New Yorkers joined Amtrak employees to welcome the arrival of the railroad’s first official passenger run of its second-generation high-speed train at the Moynihan Train Hall at Penn Station Thursday. Compared with the more low-key debut of the original, which I covered for the Daily News 25 years ago, when the concept of high-speed train travel in the United States was still brand new, the latest unveiling was more like a party.

This time, a crowd of train aficionados cheered as Acela Express Train No. 2130 arrived on Track 12. Formally the Avelia Liberty, or Acela 2, the train set assembled by Alstom in Hornell looked more futuristic than the original, with a sleeker look, automatic sliding doors and an airplane-like nose. It conceivably could hit speeds of up to 220 mph, but an Amtra

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