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.

Personality
Caitlin is a streamlined engine, designed for speed. Along with her friend Connor, Caitlin is an excitable and energetic character, who likes to be busy and loves to race. Both Caitlin and Connor are friendly and eager to get other engines to join in the fun with them. Caitlin is particularly impatient and restless if she has nothing to do. She would rather be racing than sit in a station and be idle. Caitlin and Connor were introduced to the island to bring passengers from the Mainland. They zip on and off the island frequently using the Vicarstown Rolling Bridge.

Basis
Caitlin is based on the Baltimore and Ohio Railroad streamlined President P-7 Class. Her basis was built by the Baldwin Locomotive Works in Eddystone, Pennsylvania, USA in 1927. The member of the class that Caitlin is modelled after, No. 5304 President Monroe, was fitted with a streamlined shroud designed by Otto Kuhler and classified as the P-7a in 1937 for use on the Royal Blue train service between New York City and Washington, D.C. Its streamlining was removed in 1940 and it remained without streamlining until 1947, when it, along with three other class members was re-streamlined in a different design and re-classified as the P-7d class for service on B&O's Cincinnatian train service between Cincinnati and Detroit. It was retired from service and scrapped in 1958. One non-streamlined member of this class, 5300, is preserved at the B&O Railroad Museum in Baltimore.

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.