|The Small Controller
Mr. Francis Duncan, also known as the Small Controller, is the controller of the Arlesdale Railway. He is taller than the Fat Controller and the Thin Controller; his nickname refers to the fact that his railway is often called the "Small Railway".
He was appointed by the Fat Controller, the Thin Controller and the Owner to run the line so they could get the supplies of ballast that reside in the hills on his line.
He, the Thin Clergyman, and the Fat Clergyman later went on a search for Duke in Duke the Lost Engine.
After Rex's steampipe began leaking one day and Frank had to take his train, the Small Controller began thinking they needed another engine and so he arranged for Jock to be built.
The Small Controller is very passionate about his work, and never married. He preferred instead to devote his life to work on his railway.
The Small Controller scolds Bert