quadruple-screw

“She was known as “the Big U,” an affectionate nickname for the biggest, sleekest American luxury liner plying the North Atlantic, a quadruple-screw turbine steamship that since her maiden voyage in 1952 had proudly retained the Blue Riband as the world’s fastest liner, averaging more than thirty-two knots and surpassing forty knots in occasional bursts of record speed.”

Simon & Schuster: Into the Story