Epiphany
Proverbs 17:9
What does 'off-the-rails' mean?
On the rails would be Star Trek largely resembling Star Trek. Crews of educated, highly motivated people working cooperatively (for the most part) to accomplish mutual goals under difficult circumstances.
Off the rails is significant deviation from that model (i.e. off the train track if you will). Crews who fight each other, or who disagree where that disagreement is a focal point instead of a "Sir I suggest x" "No, I think we should do y" "Yes sir" situation, characters who aren't highly motivated enthusiastic people doing exactly what they're happiest doing, all of that is off-script for Star Trek. The Vigilance is very much an outlier in Star Trek, as far as the shows are concerned. The reaction of Deep Space Nine characters to the atmosphere and environment of the Vigilance is a nice reminder that they are an outlier in your game as well.