Of the 1,400 steam locomotives that survive in the U.S. and Canada today, only about 50 are larger than the 700. Of the 300 operating steam locomotives, the 700 is in the top three. Measured by tractive effort, the 700 is the second most powerful operating steam engine in North America.
A key to the 700's abilities is its large driving wheels: 6'-5" tall. When the 700's pistons move at just 440 revolutions per minute, those large wheels propel the locomotive at an incredible 100 miles per hour. The 700 also has roller bearings on all wheels, which was unusual for a locomotive built during or before the 1930s. These bearings make its operations smooth and easy.
The 700 weighs nearly 25 percent more than the original Boeing 747. When combined with a passenger train, it is much longer and can carry nearly three times the people. When pulling freight, the 700's typical payload is 30 times more than te 747's cargo configuration. Of course, the 747 goes a bit faster.