Fir Avenue Railroad Overpass, Fairfield, Iowa

So these tracks are part of the Burlington Northern and Santa Fe Railway. I found some history about this rail line on the Jefferson County website which states that the first train to arrive in nearby Fairfield, Iowa was in 1858 from Burlington, Iowa on the Burlington & Missouri railroad. Track was laid all the was to Omaha, Nebraska after the Civil War.

The Burlington & Missouri Railroad was absorbed by the Chicago, Burlington & Quincy Railroad in 1872.

In 1901 the Chicago, Burlington & Quincy Railroad added a 2nd set of tracks paralleling the first set and realigned parts of the track in Iowa.

The Burlington Northern Railroad (BN) was created in 1970 through the consolidation of the Chicago, Burlington and Quincy Railroad, the Great Northern Railway, the Northern Pacific Railway and the Spokane, Portland and Seattle Railway. It absorbed the St. Louis-San Francisco Railway (Frisco) in 1980. Its main lines included Chicago-Seattle with branches to Texas (ex-Burlington) and Birmingham, Alabama (ex-Frisco), and access to the low-sulfur coal of Wyoming’s Powder River Basin.

GPS Location: 41°00’22.5″N 92°04’57.1″W