There is a font called "Pointedly Mad" that seems nearly identical to the old font on No. 18's tender:
http://www.google.com/imgres?imgurl=htt ... s%3Disch:1
http://www.google.com/imgres?imgurl=htt ... s%3Disch:1
There is also a font called "URW Wood font" that bears a strong resemblance:
http://www.google.com/imgres?imgurl=htt ... s%3Disch:1
http://www.google.com/imgres?imgurl=htt ... s%3Disch:1
These fonts seems to belong to either of two broader categories of fonts, one called "Western", the other...you guessed it..."Circus". If you do a Google image search of "Western font", "Circus font", "Mad Font", and "Pointedly Mad font" you'll find alot of font styles that are similar to each other, and to those originally featured on the two tenders. These fonts are all more or less evocative of the 19th Century and the "Old West"/"Wild West", which seemed to be the intent of whomever originally selected this style of lettering for the Arcade & Attica RR's excursion equipment. I somehow don't think the circus was their motivation.
The font style originally used on No. 14's tender was very similar to that originally used on No. 18's, but it was not exactly the same. The lettering on the tender of No. 14 seems unique, whereas the lettering on No. 18's tender had a more standard look about it.