internationalnavigationco

SS St. Louis, was a transatlantic passenger liner built by the William Cramp & Sons Building & Engine Company, Philadelphia and was launched on 12 November 1894; sponsored by Mrs. Grover Cleveland, wife of the President of the United States; and entered merchant service in 1895, under United States registry for the International Navigation Co., of New York with her maiden voyage between New York and Southampton, England. She was acquired by the United States Navy during the Spanish–American War and commissioned under the name USS St. Louis in 1898, and again during World War I under the name USS Louisville (ID-1644) from 1918 to 1919.[Note 1] After she reverted to her original name in 1919, she burned in 1920 while undergoing a refit. St. Louis was scrapped in 1924 in Genoa. en.wikipedia.org/wiki/SS_St._Louis_(1894)

with her neutral American signage for the u-boats

see note under

"Two complete United States Army field hospitals, which are to be attached to the Belgian Army, will be shipped to Europe on the American liner St. Louis today. With the hospitals will go four surgeons and twentyfour nurses. Each hospital is complete and the War Department was permitted by special act of Congress to turn them over to the Red Cross. "
The 24 nurses are named in this article:
New York Times, April 17, 1915
query.nytimes.com/gst/abstract.html?res=990DE5D91E3EE033A...

Good find artolog! Thanks for the NYT article which explains where these nurses are going. We will update the image descriptions with this information.