The Koeltztown Tunnel is a railway tunnel in Osage County, Missouri. It was built in 1903 by the Chicago, Rock Island and Pacific railroad. The tunnel is part of the former Kansas City to St. Louis, Missouri line, and is tunnel two of four. The line was once owned by the Missouri Central Railroad, but now is owned by the utility giant Ameren.

Koeltztown Tunnel
Overview
Official nameArgyle Tunnel (CRI&P Tunnel 2)
LineFormerly the Kansas City to St. Louis, Missouri line
LocationUnder the CR 541 country road, Osage County, Missouri, USA
SystemFormerly Missouri Central Railroad
Operation
Opened1903
Closed1980
Technical
No. of tracksSingle
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38°18′50″N 92°04′51″W / 38.31375°N 92.08076°W / 38.31375; -92.08076