The Worlds largest diesel locomotive the Union Pacific DD40X #6936 is turned on the old turntable in Cheyenne, Wyoming. The locomotive was built in 1971, weighs 270 tons, and is rated at 6,600 horsepower. This is a active locomotive mostly pulling excursion trains with the Union Pacific #844. For a in depth look at this locomotive inside and out click this link    • In depth look at the DDA40X #6922 Wor...