I used to think that the clinker and gravel you see between the rails and sleepers on the railway line was actually the "remains" of people having used the lavatories on the trains.
A childhood belief about trains

others believed things like this
- Once I used to believe that a engineer is a person who drives railway engine.— Gaurav Jain
- I used to believe that if the tyres were removed from a car, it would work perfectly on a railway track.— Anonymous Whistleblower
- I used to believe that a "punch line" meant a line of people waiting to dip punch from a punch bowl.— Sheila
- 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