--- In [email protected], "Darrell Smith" <[EMAIL PROTECTED]> wrote:
>
> Gerry,
>
> As I recall, HO scale is 3.5 mm to the foot. 4 mm scale is 4 mm to
> the foot, also known as OO scale, and operating on HO guage track,
> unless operating on EM (European Metric) track (HO) or P4 track, which
> is finescale and different guage than HO
EM is 18mm gauge (Eighteen Millimetre) It was the first attempt to get
4mm scale modelling closer to the correct gauge.
P4 is 18.83 mm gauge (i.e, exact scale for 4mm = 1ft modelling).
ASM
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