What are these poles??

Two triangular concrete poles, about 3 miles apart:

1) East side of Tilton Road in Galloway Township, New Jersey, between crossing with Aloe Road and the railroad overpass: (approximately -74.6056 39.4945). Marked "FAGS9":
    Left: from south, looking north (photo credit: Dave Lind).
    Right: From north, looking south.
    Third side blank.

2) East side of Tilton Road in Egg Harbor Township, across from dirt road that goes to an experimental VORTAC (not the operational Atlantic City VORTAC which is visible inside the fence).
(approximately -74.5891 39.4497). Marked "S9(3)":
    Left: from north, looking south.
    Right: From east, looking west.
    Third side blank.

Click here for hi-res

Possible explanations:
1) old mile-posts
2) Railroad Right-of-Way markers
3) Projects of the The Federation of Astronomical and Geophysical Data Analysis Services (FAGS)

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Last updated: 2005 Eleventh Month, 9th.