This is a lost episode, missed out of the sequence, about the history and story of roller coasters with interesting facts and famous coasters from around the world.

Sources: 

https://rollercoastermuseum.org

https://www.britannica.com/topic/roller-coaster

https://science.howstuffworks.com/engineering/structural/roller-coaster1.htm

https://www.popularmechanics.com/technology/design/a22687390/history-of-roller-coasters/

https://www.travelandleisure.com/attractions/amusement-parks/worlds-scariest-roller-coasters

https://www.linktr.ee/theworldofmomus/