A wider search with the metal detector found it destroyed, about 8 ft from measured ties and lying horizontal just below the grass roots. Removed from area to prevent someone from creating confusion by putting it back in ground.
It is an aluminum pipe with the aluminum cap and point having shafts driven into the pipe and a rivet to retain the cap. Overall length is about 30 inches. It has magnets on the top of the spear point, but they are too deep to produce a distinctive response in a magnetic locator.