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Never could make head or tail of those new-fangled disease-els! While there are distinct differences between various prototypes and models of steam locomotives, a 2-10-2 is definitely distinguishable from a 2-8-2, etc. Of course it is fairly easy to tell an FT from an E-7...
Usually it seems that they find the closest matching default font on a computer. Back in day before computer graphics, they made the font for every model.
I also wonder if you are leaning toward the difference in radio antenna between the model and prototype. The round one on the model is the same that BNSF and UP use. As the long one on the prototype, I am not familiar on NS, not sure if that is a new design they just started using or not.