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I believe this picture was taken at mile 3, right where Schad's book said they would be.  These may look fragile and light enough to lift in this picture, but they were most assuredly not.  My guess is that the wheels were probably from a construction car and not resting here as a result of a train wreck  I'll bet that some workers just pushed them over the side when they were no longer of any use.

In any case, a pretty interesting find.