Wow, those PRR electric shots are great. Only one DD-2 was built in the late '30s as a tester for a new universal series of passenger and freight locomotive that would be needed if the PRR had extended wire over the mountain from Harrisburg to Pittsburgh. Its design embodied the best features of various PRR electrics. Alvin Stauffer's Pennsy Power (c. 1962) reads that the design "never fulfilled expectations sufficiently for duplication". My book also reads that "at this writing she is assigned to the Philadelphia Region and is hauling a short turn-around job between Wilmington (Edgemoor) and South Philly". Hey, let's go check it out! She was scrapped the same year the book was published.