" 'Ello there, I'm Caitlin!"
Caitlin is a streamlined tender engine.
Before the war, she and her best friend Connor would bring passengers across the the Vicarstown Rolling Bridge to Sodor from the Mainland and back again. The two were very close and would always race. Caitlin was very close with Connor and the two were the best of friends. Caitlin missed him dearly while he was missing, but she moved on after the war ended and he joined the Ministry of Defence. Although Caitlin was without her best friend, she managed and remained her usual self.
Later, Caitlin tried to return to the Mainland by crossing The Maindland, but she was derailed by Andy. She was eventually taken to the Steamworks.
Caitlin was seen being repaired in the Steamworks during the events of Smudger. She returned to the Mainland to resume her passenger services.
089 almost crashed into Caitlin on his way to fight The Mastermind.
Caitlin is a fast and energetic streamlined engine. She enjoys helping her friends and taking passenger trains. But above all, Caitlin loves racing the most, especially with Connor.