Although I've never seen one up close from what I heard from retired co-workers at Amtrak, they say that the top lights were used as a MARS/Strobe light and red reverse light while the one's on the nose are used as the main headlight. They put this on the P30CH or "POOCH" and the first delivery of F40PH's in the 1970's. Also the front porch handrails were never added while in Amtrak service, but I do think it looks a lot better with the handrails.
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