Queen Mary   Queen Mary 2
Overall Length:   1,019 ft.   1,132 ft.
Gross Tonnage:   81,237 tons   151,400 tons
Date Launched:   26-Sep-34   December 2003
Maiden Voyage:   27-May-36   12-Jan-04
Height   181 ft. from keel to smokestack top   236.2 ft. from keel to funnel
Number of Decks:   12   17
Passenger Capacity:   1,957   2,620
Officers and Crew:   1,174   1,253
Propulsion:   Steam Turbines   Diesel-electric / Gas Turbines
Horsepower:   160,000   157,000
Cruising Speed:   28.5 knots (55.17 km./hr.)   28.5 knots (55.17 km./hr.)
Whistles:   3 - Steam type. Two on forward funnel, one on middle funnel   2 - Typhoon located at the forward and end of the funnel
Smokestacks:   3   1

 

Some comparisons:
    QM2 is 113 feet longer than the original Queen Mary
    QM2 is more than twice as long as the Washington Monument is tall (550 ft.)
    QM2 is 147 feet longer than the Eiffel Tower is tall (984 ft.)
    QM2 is more than 3 ½ times as long as Westminster Tower (Big Ben) is high (310 ft.)
    QM2 is only 117 feet shorter than the Empire State Building is tall (1248 ft.)
    QM2 is more than three times as long as St. Paul's Cathedral is tall (366 ft.)
    QM2 is as long as 41 double-decker London buses (31 ½ ft. each)
    QM2's whistle will be audible for 10 miles