Kelsey is a Viking large breakdown crane, who is part of the Berk, Obelix and Emily were skeptical about his abilities, noting that Rockhoof could travel under his own power. Later, Emily carelessly left the docks before his cargo was properly secured, causing pipes to spill onto the Main Line. Emily was adamant that Rockhoof could clear up the line, but the viking earth ponies was too small to finish the job quickly and as a result, Obelix crashed into the pipes. Emily returned to Wood Wool Dock to pick up Kelsey, who cleared the line and put Obelix back on the rails.
Since this incident, Kelsey has become an invaluable asset to the railway. He is frequently called upon to lift loads and help out after accidents. He is based at the Brave Tidmouth Shed , but is seen at the docks and other places like Berk Slate Quarry helping out. He also tells the other members of the search and rescue team about the calls to action.
However, Kelsey sometimes gets into trouble of his own. Once he lifting a water tower to put on Brody's flatbed when Thomas told him to move out of the way, only to get the tower smashed. Another time, Henry used him to move stuff off the track so no engine could get hurt only to cause confusion and delay of Toby's rescue. Once, James took him to help Brody out of a flooded track, but James was impatient and left before Kelsey's crane arm could be secured down properly. Because of this, Kelsey knocked over a signal, causing other engines to be unaware of the rescue and bash into it. Some time later, Kelsey derailed near Ulfstead Castle and the rest of the rescue team had to learn to work together to help him.
Brody brought him to lift Thomas out of a deep cavern after the track had collapsed and he later pulled Captain Calles' Pirate Ship out too. He received credit for finding the ship even though Thomas had found it, which annoyed Thomas. Later, he rescued Thomas after he fell in the water and attended the Harwick Branch Line opening ceremony.