[antisyzygy]

I know a couple railroad engineers. They basically had to give up drinking because they could lose their job.

They do some kind of test that can pick up if you drank in the last couple days.

The way they assign shifts too causes the problems. If a shift pops up, they wanna take it, and that could happen at any time.

In any case I'd wager it's related to the hangover problem. You don't want a tired, distracted (by headaches or whatever), grumpy person moving 12000 tons.