EMD DDA40X "Centennial"

3D Model

The DDA40X is a 6,600 horsepower (4.92 megawatts) D-D diesel-electric built by the General Motors EMD division of La Grange, Illinois for the Union Pacific Railroad. Nicknamed “Centennials” because they were built around the 100th anniversary of the completion of the First Transcontinental Railroad, and “Big Jack”, the DDA40X uses two diesel engine prime movers, each rated at 3,300 horsepower (2.46 megawatts). The DDA40X is the most powerful single-unit diesel-electric locomotive ever built, although more recent designs such as the GE AC6000CW and EMD SD90MAC have come close. It is the third most powerful internal-combustion locomotive ever built, exceeded only by the Russian Railways GT1 and Union Pacific GTEL gas turbine units and certain steam locomotives. It is also the longest single-unit diesel locomotive to ever be built.