Concerns over paid sick leave hurled the nation toward a potential shutdown of the U.S. rail system, responsible for 40% of long-distance freight.
Four unions voted down tentative agreements brokered by the Biden administration, and labor actions could have occurred as soon as Dec. 9. Congress quickly intervened, however, approving legislation to avoid a potential strike or lockout expected to cost the U.S. economy $2 billion a day.
Here's a look at how the ratification process unfolded for each union, and why some rank-and-file workers voted down their agreement.