Nobody has mentioned the Lionel SP Atlantic uses the Harriman boiler originally used on the 2001 UP/SP 2-8-0. Remenber Third Rail once produced an realistic 4-4-2 of the SP Atlantic with a smaller diameter boiler. Lionel uses the same frame and drivers as they did on the H9. They also uses the PRR style cyclinders with sifter valve. Oh well its only third rail.
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