A train of thought might sound like something you just happened to catch a ride on, but the phrase “Train of thought” originated in the 1650s, before trains (as in locomotives) were invented.
This “train” means a series or progression, from “drawing out”, or “pulling” or extending.
So when we follow a train of thought we might be actively extending it, drawing it out, or maybe just following the procession.
Whatever the metaphor, every train has a starting point and we can tell from the beginning where it’s headed.
A thought that doesn’t feel good won’t lead to anything better. Just like a real train it’s up to you if you jump on board.
If you want to feel good all day then stop focusing on thoughts that don’t feel good. Jump off before it picks up speed and find one heading in the opposite direction!