The Rock House Station, which was located in Jefferson County, served as a stop for stagecoaches, Pony Express riders, and weary travelers.  The Rock House Station was situated about three miles northeast of Steele City, where the Oketo cut-off merged with the main route.  Bishop and Henderson identify this first relay station in Nebraska as Rock House on their map of the Pony Express trail, while other sources suggest Caldwell and Otoe as alternative names.  http://www.nps.gov/parkhistory/online_books/poex/hrs/hrs4c.htm#14

I have located a town called Diller, NE which is approximately 3 mile NE of Steele City.