The Baldwin locomotive with the works number 60000 was a prototype that was built at their own expense in 1926 and with which the company wanted to set the course for locomotive construction of the future. It had the 4-10-2 wheel arrangement and a three-cylinder compound engine with three cylinders of the same size, the inner one serving as high-pressure cylinder.

What was special about the boiler was that the sides of the firebox were made of four-inch water pipes. They were connected at the top with 26-inch horizontal pipes that continued into the boiler barrel. The pressure was 350 psi (24.1 bars), which was significantly higher than conventional locomotives. In addition, a Worthington 4-BL feedwater heater was used.

The 60000 was intended to pull trains of up to 7,000 short tons and achieved an output of 4,515 hp at the drawbar. It was loaned to the PRR, B&O, Burlington Route, ATSF and Southern Pacific for trials and was even temporarily converted to oil firing by the SP. Although it performed very well and pulled up to 7,700 short tons, the railroads found the maintenance too expensive and no orders were placed. Today the 60000 is in the Franklin Institute Science Museum in Philadelphia.