Pennsylvania Railroad "Odd D 10003", an experimental 4-4-0 electric locomotive built in 1909. Per "15-cycle, etc.", likely a PRR publicity photo on a Pittsburgh-area test track.
Date
Source
Edward Harris Burch, Electric Traction for Railway Trains (HathiTrust), McGraw-Hill, 1911, p. 359, reproducing an image from "Fifteen-cycle, single-phase, demonstration locomotive for the Pennsylvania Railroad", Street Railway Journal30: 3 (Jul 20, 1907), p. 92 (available via ProQuest).
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