No. 1403, named “L.F. Loree” after the company's president, was the fourth of the Delaware & Hudson's high pressure locomotives. After the three previous locomotives had been Consolidations with conventional two-stage compound cylinders, 1403 was a 4-8-0 Twelve-Wheeler with three-stage expansion.

It had four cylinders, all of which acted on the second set of drivers. The high pressure cylinder with a diameter of 20 inches was located under the right side of the cab and an intermediate pressure cylinder with 27.5 inches was on the left side. On the front there were two low pressure cylinders with a diameter of 33 inches each. All cylinders had a stroke of 32 inches. They were fed by rotary cam poppet valves. To provide enough steam for the four cylinders, the combined water-tube and fire-tube boiler had a pressure of 500 psi. Overfire jets in the firebox provided enough fresh air for a better combustion.

The cylinders provided a starting tractive effort of 75,000 pounds in compound mode and 90,000 pounds in simple mode. Additionally, the rear three-axle truck of the five-axle tender had an auxiliary engine that provided an additional 18,000 pounds, for a total of 108,000. This made the locomotive perfect for heavy low-speed freights. Unfortunately, the thirties called for high speed freight traffic where more conventional super power locomotives were better suited.