Thanks to everyone who might have checked their collection for a rare photo of the steel mill engine. I found two builder photos of the Vulcan engine in the Hagley Museum near Wilmington. DE, and purchased photographic contract prints from the glass plates. They have the Vulcan photos (prior 1925), which are missing from the rest of the Vulcan collection that is in the PA State Archives, under control of Kurt Bell of Strasburg, PA.
Quest closed and engine will be names in a month.