kenny's engineering ocd

Kenny loves his trains. LOOOOOOOOOOVES them. Just not all together.

When playing with his train set, I've noticed that he only likes to have one car going at a time, usually the engine. If I link together three cars, he will immediately yank two of them off (again, more often than not, leaving the engine to run solo). I have seen him put down other toys and cross the room (both walking and crawling) to stop this horrible offense to his engineering sensibilities.

I'd love to know what his rationale is, but in the meantime, I just crack up and link the cars together from time to time just to test him.