In 1914, to operate on the Panama Canal, 40 mules were built by GE. #662 is one the mules, named after the pack animals. Mules were used for side-to-side and braking control through the locks. Four mules were used per ship, one on each side and one on each end. They each cost $13,092 and were used on the Pacific side of the canal at the Pedro Miguel locks. They each weighed 86,300 pounds and were 32'-2 1/4" in length. The mule ran on 5' gauge rails.