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[quote]QUOTE: -on prototype railroads are all curves superelevated whichever the radius and maximum allowed speed? [/quote] Not all curves on prototype are cuperelevated, only those where trains travel at high speed. [quote]QUOTE: -If yes, has someone here a mathematic rule to share (radius versus speed, radius versus angle of superelevation, speed versus angle of superelevation, or other)[/quote] Sorry, I have no idea about that. [quote]QUOTE: -about superelevated curves on a model railroad: is it an help for easy train rolling, or is it at the contrary a trend for the cars on the curve to derail inward?[/quote] You can superelevate curves on your model railroad, however, it will only be for look and won't really affect your operation unless you do it wrong (elevation too high or too sharp) which would cause your train to derail.
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