Thomas & Friends
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 Mail Train and the Flying Kipper. Unfortunately, she did not take others into consideration and ended up waking lots of people up.
Once Annie and Clarabel, who were in the yard waiting for Thomas, were accidentally coupled up to Caitlin, thanks to Charlie. She even took them to the Mainland, but was stopped by Hiro, who brought them back to Thomas.
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.
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 Bridge.
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.
Caitlin is painted fuchsia with light grey and light blue lining. She has golden nameplates on the sides of her boiler.
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- Caitlin has been partially modified to work on British railways with 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. She has also been scaled down from her basis, with the rear section of her cab and doors noticeably thinner than her basis, and as a result, her cab is too small for her crew to fit in comfortably.
- Her crew has been seen climbing into her cab in Best Engine Ever, however they were not actually seen climbing in through her cab door, possibly due to her doors being too small.
- In the twenty-first series, Caitlin gained a tail-lamp.
- Caitlin had a major rendering error in certain scenes in King of the Railway and Series 17, where her connecting rods and cylinders would face the wrong way, making her eccentric rods and piston rods move incorrectly and leaving certain parts of her connecting gear disconnected from her body altogether. This error was corrected from Series 18 onwards.
- In Best Engine Ever, the flap on Caitlin's skirt where her crew were inspecting her brakes was a compartment that housed a knuckle coupler on her basis to allow express trains to be double headed.
- Despite being based on an American locomotive, Caitlin speaks with a faint Irish accent.
- Caitlin shares her name with Hilary Fortnam's granddaughter. Fortnam was the youngest daughter of The Railway Series creator Wilbert Awdry.