Caitlin

Caitlin is a streamlined engine from the Mainland, who is designed for speed. She also has her own rake of coaches painted in a similar color scheme to herself.

Original Debut
Along with Connor, Thomas, Percy and James, she helped with the search of Stephen before Ulfstead Castle's opening. Caitlin once had to spend the night on Sodor and became too excited to listen to Sir Topham Hatt's advice. During her night on Sodor, she took the Post Train and The Flying Kipper. Unfortunately, she did not take others into consideration and ended up waking lots of people up.

Caitlin later thought that Toby was going to be scrapped after hearing about it from Gordon. Later on, she took Emily to the Steamworks after she broke down - Emily later saved Caitlin when her brakes failed and she became a runaway.

LOTM Storyline
Odd later accidentally walked into Thomas' coaches Annie and Clarabel, sending them rolling onto Caitlin's train and speeding out of Thomas' reach, until Hiro eventually found her and brought them back to Thomas.