RMS Queen Mary is a retired British ocean liner that operated primarily on the North Atlantic Ocean from 1936 to 1967 for the Cunard Line. Built by John Brown & Company in Clydebank, Scotland, she was subsequently joined by RMS Queen Elizabeth in Cunard's two-ship weekly express service between Southampton, Cherbourg and New York. These "Queens" were the British response to the express superliners built by German, Italian, and French companies in the late 1920s and early 1930s.
Queen Mary sailed on her maiden voyage on 27 May 1936 and won the Blue Riband that August; she lost the title to SS Normandie in 1937 and recaptured it in 1938, holding it until 1952, when the new SS United States claimed it. With the outbreak of World War II, she was converted into a troopship and ferried Allied soldiers during the conflict. On one voyage in 1943, she carried over 16,600 people, still the record for the most people on one vessel at the same time.
Following the war, Queen Mary returned to passenger service and, along with Queen Elizabeth, commenced the two-ship transatlantic passenger service for which the two ships were initially built. The pair dominated the transatlantic passenger transportation market until the dawn of the jet age in the late 1950s. By the mid-1960s, Queen Mary was ageing and operating at a loss.