Number 6944 is one of 47 engines built between 1969 and 1971 for the Union Pacific. This class of engine was called "Centennial" to commemorate the 100th anniversary of the completion of the Transcontinental Railroad. This type of "double" engine was the most powerful diesel-electric locomotive model ever built on a single frame. It was actually two engines on one frame. #6944 was used to haul heavy freight over the Rocky Mountains. Number 6944 is 98'5" in length and weighs 543,432 pounds with a full load of fuel and fluids. The two engines generate 6,600 horsepower and can attain a top speed of 80-90 mph. Hear more here.