Come fall of 2023, there will be a new fast train between Washington, D.C. and Boston. Amtrak’s new Acela fleet is replacing trains more than 20 years old. See how the new trains go from aluminum car shells to ready for passengers. Read more: https://wapo.st/3LCJVws. Subscribe to The Washington Post on YouTube: https://wapo.st/2QOdcqK

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