Relating to the PRR discussion topic below, this is in the ‘what goes around come around’ category. Back in 1914 Westinghouse had developed the prototype for the Pennsylvania MP-54, but the wires were not up and ready on the Philadelphia main line. Westinghouse’s test track in Pittsburg was not of a sufficient length for a real life testing. The Pennsylvania entered into an agreement with the New Haven to use the test unit on the New Canaan Branch. Despite the successful test runs, the New Haven itself was not totally sold on the mercury rectifier equipment due to the additional space required for the equipment and the novelty of the system. That changed forty years later with the introduction of the Pullman-Standard 4400 series. The picture in the attached article shows the test unit on the New Canaan Branch.