OMAHA, Neb. (AP) — When BNSF railroad conductor Justin Schaaf needed to take time off from work this summer, he had to make a choice: go to the dentist to get a cavity in his molar filled or attend a party for his son's 7th birthday.

He chose his son.

"Ultimately I decided to take the day off for my kid's birthday party," Schaaf said. "Then when I am finally able to get into the dentist four, five, six months later, the tooth is too bad to repair at that point, so I have to get the tooth pulled out."

Those are the kind of tradeoffs that railroad workers worry they might still have to make afte...