I used to believe that the trains in Thomas the Tank Engine were real, but rare and special, and that other trains were "regular" or "ordinary" trains that didn't have a face.
A childhood belief about trains

others believed things like this
- After seeing Thomas the Tank Engine, I believed that all the locomotives in the world had a face.— Joe
- I used to think underground trains actually descended into the tunnel, like a rollercoaster.— Natasha
- My mom would tell me to stay off the railroad tracks because the trains were silent and super fast.— Roger
- When trains (subways) go underground, my little sister thought that the lights were shooting stars.— Katie
- I used to think that the TV show "Shark Tank" involved actual sharks in a tank.Anon
- i used to believe that the smurfs lived in ordinary mushrooms and i would never eat them!!!— eimear