I thought I'd scanned all from this "Flying Switch" series some time ago but, I came across this one just today. a local crew was switching out this car just north of the U&D switch in Kingston. They were performing a "flying switch" but, gravity alone didn't take that boxcar far enough on it's own to clear, hence the strong arm action! Right place at the right time to catch the move!
For the model railroaders: Neat idea for an operations move or just a scene:-)