Matt:
After doing a little digging I discovered that station signage (standard signs and RGS) had been done in various scales previously by David Bigge under the Narrow Gauge Graphics company. That is the good news I suppose, the bad news is David is no longer selling his dry transfers and they don’t look anything like yours. He took his lettering font from a 1907 D&RGW document that he thought came from Maxwell. Check the Nov. /Dec. 1985 Narrow Gauge Gazette for an article David wrote on making various line side signs.
Another source of RR dry transfers is Clover House (www.cloverhouse.com) which sells various fonts that may also be applicable. The interesting point here is that the Mears Junction sign photo that was posted here is a Serif font while other signs from the era you are looking for are sans serif, more like a block medium which I suppose doesn’t surprise me given the range of structures and their upkeep or lack thereof over the years. Bottom line, to be historically accurate you need to review photos of the specific sign(s) in the era you are modeling. As a case in point, the “C” and “E” on the Dulce station sign look to me like they had a little field retouching over the years
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