At this point I'm assuming the wheel truing machine at CI Yard is broke. not too long ago damn near every R68A set had flat wheels, their much better now, probably SMS work.
Those flat wheels must scare the crap out of bikers and Walkers on the Manhattan Bridge whenever those flat wheel sets travel over the bridge.
The Pikin Yard R46s are still holding up pretty good, 45 years old and still the backbone of the longest line in the system, impressive!