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Are tickets purchased before the changeover (but not printed yet) able to be printed as e-tickets now, or do they still need to be printed as conventional tickets?
As long as it does not include a bus segment (most are not set-up for scanning), you can get an e-ticket. If you open your reservation on Amtrak.com (assuming you made it on-line), there should be an option to send an e-ticket PDF.