Rail Gauges
Only two rail gauges are preferred numbers, and these are likely accidental, but are remarkable in that they are in the R10 series whether expressed in inches or millimetres.
The more common gauge is the Irish gauge, 63 inches, which rounds to 1600 mm, both numbers in the R10 series. It is also used in Australia and Brazil. The other gauge is just half this, 800 mm or 31.5 inches, and is used by the Wengernalpbahn in Switzerland, between Lauterbrunnen and Grindelwald by way of Kleine Scheidegg.
Read more about this topic: Preferred Number
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