This from Danny Nelms:

Needs more info…

Steve loftin collection 
From steve
“Darley had a few rigs on order using the 1871W cab and chassis when Hendrickson sold that product line to Kovatch Mobile Equipment.  Therefore, a handful were delivered with KME nomenclature.  
While I know of at least three of these, there were probably no more than a handful were delivered. 
Lyons, IL – Engine 311 198_  KME/Darley _?/_? – Diesel/_?
Lyons FIre Department history

WS Darley Company delivery photos of Lyons FD Engine 311 – click to download