Olympic-class ocean liner so, the "Olympic"-class ships were built to surpass rival Cunard's largest ships, "Lusitania" and "Mauretania", in size and luxury. "Olympic", along with "Titanic" and the soon to be built "Britannic", were intended to be the largest and most luxurious ships to operate on the North Atlantic, but not the fastest, as the White Star Line had already switched from high speed to size and luxury. The three vessels were designed by Thomas Andrews and Alexander Carlisle. Construction of "Olympic" started in December 1908 and "Titanic" in March 1909. The two ships were built side by side. The construction of "Britannic"
Olympic-class ocean liner began in 1911 after the commissioning of "Olympic" and "Titanic" launch. Following the sinking of "Titanic", the two remaining vessels underwent many changes in their safety provisions. All three of the "Olympic"-class ships had nine decks, seven of which were for passenger use. From top to bottom, the decks were: Propulsion was achieved through three propellers: two outboard or wing propellers had three blades, while the central propeller had four. The two lateral propellers were powered by reciprocating steam triple expansion, while the central shaft was driven by a steam turbine. All power on board was derived from a total