Caitlin

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

Trivia

 * Caitlin has been modified for use on British rail: she has a screw-link coupling and buffers on the back of her tender. She retains a streamlined cow-catcher (also known as a skirt) on the front, so she is unable to shunt. Her headlamp has also been moved to accommodate her face, placed on the skirt where her prototype carried its railway's logo, which is also circular.
 * Her valve gear and side-rods would not be physically possible in real-life.
 * In the twenty-first season, Caitlin gained a tail-lamp.