I thought the underground railroad was actually a subway.
A childhood belief about trains

others believed things like this
- Until I was in High School, I really thought that the "underground railroad" was under the ground.— S
- My mom would tell me to stay off the railroad tracks because the trains were silent and super fast.— Roger
- When I was little I thought the london underground was a terrorist organisationAnon
- When trains (subways) go underground, my little sister thought that the lights were shooting stars.— Katie
- that hills were giants buried underground...— tracy g
- That there was an underground tunnel linking New York to San Francisco.— Christophe Chang