The RMS Empress of Britain was an ocean liner built between 1928 and 1931 by John Brown shipyard in Scotland and owned by Canadian Pacific Steamship Company. This ship — second of three CP vessels named Empress of Britain — provided scheduled trans-Atlantic passenger service from spring to autumn between Canada and Europe from 1931 until 1939. This Empress was distinguished by the Royal Mail Ship (RMS) prefix in her name while in commercial service with Canadian Pacific.
In her time, she was the largest, fastest, and most luxurious ship between England and Canada. She was torpedoed on 28 October 1940 by U-32 and sank. At 42,348 gross tons, she was the largest liner lost during the Second World War and the largest ship sunk by a U-boat (Wiki).