Does the word "rail" refer to a train rail? Something like a track?
Good question. Yes, the word "rails" here is in reference to train tracks. However, the phrase "off the rails" is actually an idiom. It is generally used to talk about something or someone behaving either in a chaotic, dysfunctional, or disorderly manner. It is also used to mean that someone or something begins behaving in a strange, abnormal, or wildly uncontrolled way. Like a train off it's track. While there is usually a nuance of it being a negative thing, here it is being used to kind of mean "let's go crazy" or " let's get wild". Ex: Our project has started going off the rails once the manager quit. Ex: If my kids have too much sugar, they really go off the rails.
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