From the record
“The Quitaque Railway Tunnel or Clarity Tunnel is a 582 feet (177 m) abandoned railway tunnel in Floyd County, Texas about 10 miles (16 km) southwest of Quitaque. Construction started in 1927, and the tunnel and associated railway line were completed and opened for use in 1930.”
Wikipedia article Quitaque Railway Tunnel, CC BY-SA 4.0.
One of 1 National Register listings published here for Floyd County · listed in 1977 · category: Structure.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service