Wikipedia:
PRR R1
R1 was a prototype of electric locomotive built for Pennsylvania Railroad railways of the United States. It had a 4-8-4 wheel arrangement in the Whyte notation, 2-D-2 in the AAR standards and 2'Do2' in the UIC classification. It was built as a competitor to the GG1 design, and narrowly lost as it did not ride quite as smoothly. It remained in service after the tests.
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