On an interesting corollary, knowing what dangerously little I know about the MTA and its unions, are drivers griping about disease exposure? The NY subway is fairly labour-intensive as mass transit systems go...
I think the workers are going to be fine. The drivers and conductors have compartments. Station attendants have booths. The subway unions had to deal with the near-constant crime of the 70s and 80s, and didn't really want their workers out interacting with the general public. That turns out to be helpful in this case.