Yeah it's crazy. The John Oliver segment was eye opening about the myriad of issues. At 3 miles long with 1 engineer, they sometimes have to walk miles to the end and then of course back in order to fix something. They frequently block roads and emergency responders for hours sometimes and people die. The trains are essentially ticking time bombs as they commonly carry flammable/toxic/explosive materials with no tracking and they go through towns where the tracks weren't designed for trains of that length. The end of the John Oliver skit has them do their own very dark episode of Thomas the Train that satirizes these issues.
Edit: I think there may be 2 staff, but they're trying to change it to 1 and you basically aren't allowed to ever call in sick or else you're fired.