14inchgun

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A similar photo is in The Guthrie daily leader., June 10, 1920, HOME, Image 1 chroniclingamerica.loc.gov/lccn/sn86063952/1920-06-10/ed-... and in The Sun and the New York herald., June 13, 1920, Section 5 Rotographic Section, Image 60 chroniclingamerica.loc.gov/lccn/sn83030273/1920-06-13/ed-...

Both photos were likely taken at New York Navy Yard on the day of the battleship's commissioning, 3 June 1920. The deck view is taken from the ship's fantail looking forward. Note numerous visitors on deck, including women in formal attire, as well as photographers with tripods, indicating a festive occasion, yet a great number of shipyard workers dressed for work occupy most of the topside spaces above the main deck. The ship is incomplete -- scaffolding surrounds the main top, and calibration equipment is attached to the 14-inch guns of No.4 main batter turret. TENNESSEE was officially completed and delivered to the Navy on 16 September 1920.

Christopher Cavas follow photo link for article about commissioning ceremony.

Apparently one of three railway guns (each mounting a 14-in/50" caliber naval gun) built by Baldwin Locomotive Works for the US Army (given the "U.S.A." markings; US Navy railway guns were marked "U.S.N" or "U.S. Navy") during the First World War. These were identical to the US Navy's Mark I railway guns. However, unlike the Navy's railway guns, the US Army's railway guns did not see combat. They were completed in September 1918 and not shipped to Europe prior to the Armistice. See: en.wikipedia.org/wiki/14%22/50_caliber_railway_gun

A 14-inch/50-caliber gun and Mark I Army Railway Mount built by Baldwin Locomotive Works. en.wikipedia.org/wiki/14%22/50_caliber_railway_gun See: www.flickr.com/photos/library_of_congress/32432654791/