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As I understand it, HO is generally continental outline to a scale of 3.5 mm to 1foot, OO is usually British outline at a scale of 4mm to 1foot, and Dublo is the second word of the name of the now defunct Liverpool based manufacturer Hornby-Dublo, not to be confused with present day Hornby as the rights to the name have been held by several firms in the past.
Ho = Half O Gauge. O Gauge is 7mm to 1 foot scale.
Hope this helps, Regards, 62440.
Last edited by 62440; 30th December 2009 at 18:13.
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