Logan is a steam shunter who looks like a diesel. He works on The Other Railway.
Logan arrived on Sodor on the day of the Sodor Talent Show. He was responsible for arranging trains for Edward and Gordon in preparation for the show. When Edward and Gordon arrived at the coaling plant to fill up on coal and collect their trains, Logan could not tell them apart because they were facing him tender-first. As a result, he gave Gordon a train of troublesome trucks filled with bubble liquid for Mr. Bubbles, believing Gordon to be Edward. When Logan gave Gordon's coaches to Edward, he realized his mistake and set off to catch up with Gordon.
Gordon at first mistook Logan for a diesel. However, after a friendly chat, Gordon learned that Logan was a steam shunter and praised him for his work ethic. Later that day, Logan returned to his work at the coal mine.
Logan and Sam later returned to the Mainland after their work on Sodor was done.