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Norfolk & Western J Class 4-8-4. Solid forged steel frame that includes the cylinders. Forced lubrication of oil and grease from reservoirs meaning it can go 1300 miles without additional lubrication. All roller bearing running gear. Light weight valve gear allows sustained 100 mph speeds despite having 70 inch drivers. 80,000 lbs of tractive effort, no booster truck needed. 5000 horsepower at the drawbar. Integrated streamline cowling allows for ease of maintenance. On initial test runs the class leader, #600, ran 100 mph over level ground pulling ten 75 ton heavyweight passenger cars.
