There was 10 car set sitting between stations S/B between Nostrand and Kingston-Throop Ave, NIS. Eventually it passed my train and went though Utica Ave.
My stopped at Utica, riders boarded and exited, my train left and caught up to that same OOS R179 set! That 179 had to have an mechanical problem of some sort, as the 179s are leaps and bound faster than the R46.
There was also a large gap in service as I had JUST missed a train, 10 minutes later no came and a C train came... this was due to an gap in service cause an train had to be removed from service at 175th street.