Another question like "How long is a piece of string?"
Probably the smallest you can buy, like code 40 for some of the American
However, what HOn3? If it were South African or Australian then perhaps
code 83 might be better. Supposing you were modelling the CNR narrow gauge
in Newfoundland. Pre diesel, code 40 may be OK but what about in the 1960s
70s or 80s up until it closed? Code 70, or perhaps code 83? And what about
sidings, spurs, yard tracks? Code 40 or code 70?
Not a simple question and lots of answers.
Home of the Great Eastern Railway
You probably will want to use code 40, 55, or 70 as there are also
commercial track products for HOn3 in each of these codes. Code 40 will
probably be the most realistic but once the rail is weathered and ballasted
55 and 70 look good too. What prototype are you going to model?
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