new notebook

When I hear somebody say
"You interrupted my train of thought"
All I can think is:
How on earth do you interrupt a train?...
Just walk on to the tracks and say, "Um, hello, excuse me, train, could I talk to you for a moment or tw-?...train, excuse me, train, train--"
Splat.
Put something in its way that will stop it, like a penny? A good idea in theory, Calvin, but I'm afraid either the penny will be flattened or you'll cause a crash.
No, trains are completely non-negotiable. They were not made to be interrupted. They were made to stop or go, with nothing in between. Either the train is derailed or does not notice your attempt to distract it.
Here's another idea: does everybody think in trains?
If you opened a person's head and peeked into their mind, would you simply find thousands of little trains, each a different color and racing a different direction across the crisscrossed network of railroads in their brain? Would you find that some are slow and some are fast? Some old and some new?
Maybe it depends on the person. Maybe some have only one train, a very big and powerful one. An express train that, once it reaches its destination, switches immediately to a different track. Maybe children have electric toy trains: simple, harmless, and innocent. Maybe old people have steam trains that puff along slowly and steadily, bringing with them the memories of another time.
Maybe thoughts aren't actually trains at all. I don't know.
What do you think?