The "Imperator" class ocean liners were a series of three ocean liners designed for the Hamburg America Line, commonly known as "HAPAG".
 These three ships were commissioned by the chairman of HAPAG Albert Ballin.
 Namely the "Imperator" (1912), the "Vaterland" (1913) and the largest, the "Bismarck" (1914).
 These liners were over 50,000 tons, sported three funnels and had a length ranging from 906 ft (276 m) to 955.8 ft (291.3 m).
 To this day, the "Vaterland" is the largest passenger ship operated by a German shipping company.
This is a list of ocean liners past and present, which are passenger ships engaged in the transportation of passengers and goods in transoceanic voyages.
 Ships primarily designed for pleasure cruises are listed at List of cruise ships.
 Some ships which have been explicitly designed for both line voyages and cruises, or which have been converted from liners to cruise ships, may be listed in both places.
 Also included are cargo liners designed to carry both cargo and passengers.
The "Barbarossa" class was a class of ocean liners of North German Lloyd and the Hamburg America Line of the German Empire.
 Of the ten ships built between 1896 and 1902, six were built by AG Vulcan Stettin, three were built by Blohm & Voss, and one was built by Schichau-Werke; all were built in Germany.
 They averaged  gross register tons (GRT) and featured twin screw propellers driven by quadruple-expansion steam engines.
The Kaiser-class ocean liners or Kaiserklasse refer to four transatlantic ocean liners of the Norddeutscher Lloyd, a German shipping company.
 Built by the AG Vulcan Stettin between 1897 and 1907, these ships were designed to be among the largest and best appointed liners of their day.
 These four ships, two of whom held the prestigious Blue Riband, were known as the "four flyers" and all proved to be popular with wealthy transatlantic travellers.
 They also took great advantage of the masses of immigrants who wished to leave Europe.
Augusta Victoria, later Auguste Victoria, placed in service in 1889 and named for Empress Augusta Victoria, wife of German Emperor Wilhelm II, was the name ship of the Augusta Victoria series and the first of a new generation of luxury Hamburg America Line ocean liners.
 She was the first European liner with twin propellers and when first placed in service, the fastest liner in the Atlantic trade.
 In 1897, the ship was rebuilt and lengthened and in 1904 she was sold to the Imperial Russian Navy, which renamed her Kuban.
The "Olympic"-class ocean liners were a trio of British ocean liners built by the Harland & Wolff shipyard for the White Star Line during the early 20th century.
 They were "Olympic" (1911), "Titanic" (1912), and "Britannic" (1915).
 All three were designed to be the largest and most luxurious passenger ships in the world, designed to give White Star an advantage in the transatlantic passenger trade.
 Two were lost early in their careers: "Titanic" sank in 1912 on its maiden voyage, after hitting an iceberg in the North Atlantic Ocean, and "Britannic" in 1916, after hitting a mine laid by the minelayer submarine "U-73" in a barrier off Kea in the Aegean Sea during World War I.
 "Olympic", the lead vessel, had a career spanning 24 years and was retired in 1934 and sold for scrapping in 1935.
RMS "Majestic was a White Star ocean liner working on the North Atlantic run, originally launched in 1914 as the Hamburg America Line liner SS "Bismarck.
 At 56,551 gross register tons, she was the largest ship in the world until completion of  in 1935.
SS "Bremen" was a German-built ocean liner constructed for the Norddeutscher Lloyd line (NDL) to work the transatlantic sea route.
 "Bremen" was notable for her bulbous bow construction, high-speed engines, and low, streamlined profile.
 At the time of her construction, she and her sister ship "Europa" were the two most advanced high-speed steam turbine ocean liners of their day.
 The German pair sparked an international competition in the building of large, fast, luxurious ocean liners that were national symbols and points of prestige during the pre-war years of the 1930s.
 She held the Blue Riband, and was the fourth ship of NDL to carry the name "Bremen".
A four funnel liner, four funnelled liner or four stacker is an ocean liner with four funnels.
 The SS "Great Eastern", launched on 31 January 1858 (a full 40 years ahead of any comparable ships), was the only ocean liner to sport five funnels.
 As one funnel was later removed, the "Great Eastern", by default, became the first ocean liner to have four funnels.
 However, after the Great Eastern became a four funnel ship she never carried passengers so really should not be considered the first four funnel liner.
 The SS "Kaiser Wilhelm der Grosse", launched on 4 May 1897, was properly the first ocean liner to have four funnels and was one of the first of the golden era of ocean liners that became prominent in the early- to mid-20th century.
 The most famous four funnel liners are the RMS "Titanic", which sank after striking an iceberg on her maiden voyage on 14 April 1912, and the RMS "Lusitania", which was torpedoed on 7 May 1915 during the First World War.
USS "Susquehanna" (ID-3016) was a transport for the United States Navy during World War I.
 She was the second U.S. Navy ship to be named for the Susquehanna River.
 Before the war she operated at SS "Rhein, an ocean liner for North German Lloyd.
 She was the lead ship of her class of three ocean liners.
 After the end of World War I, the ship operated briefly in passenger service as SS "Susquehanna.
 Laid up in 1922, "Susquehanna" was sold to Japanese ship breakers in 1928 and scrapped.

Question: The Imperator-class ocean liners were a series of three ocean liners designed for the Hamburg America Line, which included the RMS Majestic, originally launched in 1914 as the SS what?
Answer: Bismarck