Sister ship

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A sister ship is a ship of the same class or of virtually identical design to another ship. Such vessels share a nearly identical hull and superstructure layout, similar size, and roughly comparable features and equipment. They often share a common naming theme, either being named after the same type of thing or person (places, constellations, heads of state) or with some kind of alliteration. Typically the ship class is named for the first ship of that class. Often, sisters become more differentiated during their service as their equipment (in the case of naval vessels, their armament) are separately altered. For instance, the U.S. warships USS Iowa, USS New Jersey, USS Missouri and USS Wisconsin are all sister ships, each being an Iowa-class battleship. A notable group of sister ships were the White Star Line's Olympic-class ocean liners trio, consisting of RMS Olympic, RMS Titanic, and HMHS Britannic. As with some other liners, the sisters worked as running mates. Of the three sister...

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