The Nevada—California—Oregon Railway Co. Depot, commonly known as the N.C.O. Depot or The Whistle Stop, is a historic site in Alturas, California, listed on the National Register of Historic Places. It was built 1908 to serve as the passenger station for Alturas on the Nevada–California–Oregon Railway. It has been home to the Alturas Garden Club since at least 1962.

In 1880, the Nevada and Oregon Railroad was founded; it was sold in 1884 and renamed the Nevada–California–Oregon Railway (N.C.O.). N.C.O. began regular rail service for Alturas on December 1, 1908. The N.C.O. depot was initially located at the intersection of Twelfth and Oak Streets, near the railyard, but was disassembled and moved, stone by stone, to its current location in 1915 to be closer to the central business district of Alturas.

In 1926, the Southern Pacific Transportation Company purchased the N.C.O., converting the line to standard gauge starting in 1927. Passenger service to Alturas was discontinued on January 1, 1938, and the depot was converted for use as railroad crew housing. The Alturas Garden Club acquired the depot in 1962.

The depot was constructed from stone blocks from a local quarry and is placed with its longest side parallel to the railroad tracks. The eastern facade, which overlooks the tracks, has a centrally-located operator's bay, with the former baggage room to the north and the former waiting room to the south. It is largely unmodified from its days as a passenger depot, and is built in the late Queen Anne style, with an appearance more in common with contemporary stations in the eastern United States than other stations in California.

• National Register of Historic Places listings in Modoc County, California

• Price, Marjorie (November 28, 1983). "NRHP Nomination: N.C.O. Depot". National Register of Historic Places. National Park Service.

Media related to Alturas, California at Wikimedia Commons

• "Depot Site Chosen". Sacramento Union. 24 September 1907. Retrieved 29 April 2017.
• "Will Move Depots On Narrow Gauge". Sacramento Union. 19 August 1914. Retrieved 29 April 2017.
• "State's Last Frontier to Welcome First Train". Healdsburg Enterprise. 20 October 1927. Retrieved 29 April 2017.