I'll start my blurb with a parental guidance warning.
This video is in German, but has some very fruity language in the subtitles. You have been warned.
That aside, it probably helps if you know something about how the railways work and the general attitude of staff to management; those readers who know me personally will have a good idea of how I regard those who pretend to run the railway from a management position. Trust me, I'm one of the moderates.
The way that annual leave requests work is often seen as a bit of a lottery (because it often is) except for the rostered weeks that you're simply told you're having. Often you'll not know whether you can have a day off until a week or even less beforehand.