The two outer propellers were driven by reciprocating engines of the triple-expansion type. They each developed 15,000 indicated horsepower at 75 r.p.m. This room also contained much of the auxiliary machinery, including the refrigerating plant.
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*The surface heater (heating & cooking exhaust) and its associated air pump were not present on the Olympic as built, but were added later and were also fitted to the Titanic.
