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Don't think he will be retuning to taking the train. He is, after all, Vice President of the U.S. From your link:
"Biden, who rode Amtrak trains back and forth to Wilmington on weekends for years as a senator, said he was forced by the Secret Service to use air transport instead of the train when he became vice president. But it’s not at all clear why, given that he no longer represents Delaware, he must return there so frequently."