A U.S. union official alerted the Biden administration to health problems caused by the Norfolk Southern derailment in February, saying that some workers have become sick.
In a letter obtained by CNBC, union representative Jonathon Long said Wednesday that rail workers have fallen ill at the East Palestine, Ohio, crash site.
"Many other Employees reported that they continue to experience migraines and nausea, days after the derailment, and they all suspect that they were willingly exposed...
