<Li> G Deck, the Lower Deck, was the lowest complete deck that carried passengers, and had the lowest portholes, just above the waterline . The squash court was located here along with the traveling post office where letters and parcels were sorted ready for delivery when the ship docked . Food was also stored here . The deck was interrupted at several points by orlop (partial) decks over the boiler, engine and turbine rooms . </Li> <Li> The Orlop Decks and the Tank Top below that were on the lowest level of the ship, below the waterline . The orlop decks were used as cargo spaces, while the Tank Top--the inner bottom of the ship's hull--provided the platform on which the ship's boilers, engines, turbines and electrical generators were housed . This area of the ship was occupied by the engine and boiler rooms, areas which passengers would have been prohibited from seeing . They were connected with higher levels of the ship by flights of stairs; twin spiral stairways near the bow provided access up to D Deck . </Li> <P> Titanic was equipped with three main engines--two reciprocating four - cylinder, triple - expansion steam engines and one centrally placed low - pressure Parsons turbine--each driving a propeller . The two reciprocating engines had a combined output of 30,000 hp and a further 16,000 hp was contributed by the turbine . The White Star Line had used the same combination of engines on an earlier liner, the SS Laurentic, where it had been a great success . It provided a good combination of performance and speed; reciprocating engines by themselves were not powerful enough to propel an Olympic - class liner at the desired speeds, while turbines were sufficiently powerful but caused uncomfortable vibrations, a problem that affected the all - turbine Cunard liners Lusitania and Mauretania . By combining reciprocating engines with a turbine, fuel usage could be reduced and motive power increased, while using the same amount of steam . </P> <P> The two reciprocating engines were each 63 feet (19 m) long and weighed 720 tons, with their bedplates contributing a further 195 tons . They were powered by steam produced in 29 boilers, 24 of which were double - ended and five single - ended, which contained a total of 159 furnaces . The boilers were 15 feet 9 inches (4.80 m) in diameter and 20 feet (6.1 m) long, each weighing 91.5 tons and capable of holding 48.5 tons of water . </P>

What type of engine did the titanic have