The Milwaukee Road Dynamometer Car X-5000

The Dynamometer Car was originally designed and built by the Milwaukee Road at the Milwaukee Shops in 1930 to measure steam locomotive output by means of a large hydraulic unit spliced into the center sill called a dynamometer unit that generates a hydraulic pressure proportional to the drawbar pull or buff (push) measured at the coupler of car.

Milwaukee Road Dynamometer Car Video

The car is 70ft long and weighs 77.5 tons. It is said by some to be one of the strongest cars ever built with structural supports every 12-18in. It was designed by Vern Green and Leonard Lentz.