From the record
“The McHenry Railroad Loop near McHenry, North Dakota was built in 1899 by the Northern Pacific Railway Company. Also known as McHenry or as End of Line or as Northern Pacific Railroad Turn Around Loop, it was listed on the National Register of Historic Places in 1986.”
Wikipedia article McHenry Railroad Loop, CC BY-SA 4.0.
One of 6 National Register listings published here for Foster County · listed in 1986 · category: Structure.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service