Brass Rail JNL is a novelty font, with its name stemmed from 2 essential parts of the source material. It was designed from examples of vintage small letters marked out of brass with 'rails' above and below each character to fit within a slot.
The more than likely usage of these letters would have been for either decorative initials or little retailing signs (similar examples of both have actually been seen in the past).
.From these few examples comes a typeface with numerals, punctuation and a prolonged character set.
.Font Family: Brass Rail JNL Regular