As far as I can tell, trains have been running fine. The only thing that might cause delays is that there is construction on some lines at given times. Anyone who rides the subways with frequency in NYC can tell you that there are always delays during times of track work. However, that is due to the trains running around the work itself not because of any layoff issues.
Other then that, at least for me, I have not noticed any change in pattern for the run of the NYC subways.
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