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o gauge vs. o27

  1. O Scale
    I have a 1955 Lionel O gauge set I got as a child. I want to expand and get another locomotive. Referring only to Lionel post-war items I am confused by the model numbers. Does anyone know if it is correct to assume that the 4 digit models, e.g. 2025 would be O27 and the 3 digit models are O...