Weighing in at more than 400,000 pounds and with a length in excess of 80 feet and massive 4,300 horsepower tractive effort, the SD90/43MAC is one of the heaviest, longest, and most powerful single diesel locomotives in the world. To date, there have been three production "versions" of the SD90MAC. The SD90/43MAC was originally designed with a 6,000hp engine in mind, but was fitted with a smaller and more reliable 4,300hp engine that ended up being kept that way by most railroads, even though the option to upgrade to the higher horsepower engine was offered at a later date.

• Powerful five-pole KATO motor with dual brass flywheels
  
• Directional Headlight and preprinted numberboards
  
• Kato magnetic knuckle coupler
  
• DCC Friendly mechanism ready for drop-in decoder installation
  
• Drop in DCC compatible with the Digitrax DN163K2 or Train Control Systems K2D4