F17 is an abstract point representing the border between Manhattan and Brooklyn, and A62 is Liberty Junction tower (the interlocking just beyond Rockaway Boulevard station where the IND Rockaway Line diverges from the Fulton Street Line). In general, though, any stop ID which appears in the GTFS-rt feed but does not appear in the GTFS stops.txt file should be treated as a non-revenue stop and can be dropped.
Some prior discussion of this issue, for reference:
https://groups.google.com/g/mtadeveloperresources/c/CbDdTTgfaqw/m/-U1cR9ULBAAJ
https://groups.google.com/g/mtadeveloperresources/c/ZQPZWHPfPoo/m/Cq7HcRqaDwAJ
Kurt Raschke
NYCT | Subways | Technology
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