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Harrison was also one of the many chuggers affected by the major diesel shortage caused by extreme levels of ice. Not long after that, Harrison had to prepare for an important passenger test with Hanzo after constantly thinking about a good place to end his tour for the test, Harrison realized that it would be interesting to show the passengers what goes on around Chuggington behind the scenes, remembering an important piece of advice given by Mtambo. He was also recruited to assist Brewster in hauling the demolisher for the Chuggineers, but broke down before he could even reach the Drop and Load Yard. Harrison demonstrated the Super-Glide 100 at one of the annual rolling stock shows. Later that day, Harrison pulled the prince of Buffertonia around the Depot for all to see. Because of this, Harrison saw the error in his ways and promised to be better, especially around younger chuggers. Harrison demonstrated his reckless moves to the trainees, leading Wilson (who idolizes him) to imitate him, nearly causing a derailment. Some time after this, Harrison was sent back to the Training Yard after failing horrendously to listen to Old Puffer Pete's advice, during a test run to see if Harrison was fit for pulling the royal coach.
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Even with Koko becoming immobile due to a power cut, leading to Wilson having to pull her back to the Depot, Brewster was able to get the entire night shift to Tootington on time. Harrison usually takes the daily night shift to Tootington to import goods, but after he broke down during the night, Wilson, Brewster and Koko were assigned to take the load the next evening.
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Harrison was initially a trainee with Chatsworth the two still sleep next to each other at the Roundhouses and generally perform the same jobs.
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