I would say very unlikely, very very unlikely.
ON3 was very wide spread as a common carrier in the late 1870s. Think of all the colarodo narrow gauge most famous were D&RGW and RGS. Also the East Broad Top and the Ohio River and Western in Ohio were quite established and long running. ON2 was only used in Maine as far as I know on a few small railroads that were common carriers. ON2 was used a lot in industry I think.
ON30 (2 1/2 feet) was used in industrial applications in the US, but not as a common carrier as far as I know. I think ON30 or 750MM or 760MM (both used in Germany) were more often used as common carrier gauges in other countries including south American.
So to sum up, if you want to model a narrow gauge RR in the USA, there is much much more to choose from in ON3 than anything else.
