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Reply to "HO scale question"

HO at 3.5mm to the foot comes from Europe where the scale originated in the early 20's and true O scale is 1:43.5 as opposed to what we use in the US as OW5 or 5' between the rails at 1:48.  That war was fought in the 30's and 1:48 won.  Who knows why, but 1/4" to the foot is easier to calculate than 17/64" to the foot.

Originally 4mm and 3.5mm were considered HO, but eventually it got sorted out in the mid to late 20's that HO was 3.5 mm to the foot and 00 was 4 mm to the foot.  

Confused yet?

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