 Marlborough was <unk> feet 9 inches ( 190 m ) long overall and had a beam of 90 ft ( 27 m ) and an average draught of 29 ft 6 in ( 9 m ) . She displaced 25 @,@ 000 long tons ( 25 @,@ <unk> t ) as designed and up to 29 @,@ 560 long tons ( 30 @,@ <unk> t ) at combat loading . Her propulsion system consisted of four Parsons steam turbines , with steam provided by eighteen Babcock & Wilcox boilers . The engines were rated at 29 @,@ 000 shaft horsepower ( 21 @,@ 625 kW ) and produced a top speed of 21 @.@ 25 kn ( 39 km / h ; 24 mph ) . Marlborough 's cruising radius was 7 @,@ 800 nautical miles ( 14 @,@ 446 km ; 8 @,@ <unk> mi ) at a more economical 10 kn ( 19 km / h ; 12 mph ) . She had a crew of 995 officers and enlisted men ; during wartime this increased to up to 1 @,@ <unk> . 
