English: According to the source, United States Library of Congress, this is an image of Titanic's stern and rudder.
Others claim it to be of her sister Olympic ( Bruce Beveridge: Titanic—The Ship Magnificent Volume One: Design & Construction, 2008, The History Press, page 100).
The ship in this photo is in fact the Olympic. Taken in 1911, the Titanic was not fitted with propellers until February or March of 1912. To date, there are no known photographs of her propellers, whereas the Olympic had hers photographed quite often. "When Olympic entered service in 1911, her propellers were photographed and these well-known photos show her turbine-driven central propeller as a four-bladed casting" (See at discussion in Encyclopedia Titanica).