Royal Mail Steamer Ulfstead Castle

On the 12th of May, 1945, The Three Railway Engines was published in the United Kingdom. It would lead to become the most famous railway franchise in fiction: The Railway Series. In-universe, two major castles exist on the Island of Sodor: Ulfstead Castle and Suddery Castle.
This is the Royal Mail Steamer Ulfstead Castle, named after the Sudrian castle in the village of Ulfstead. She measures 599.42857143 feet long and is based on the RMS Lusitania. The Ulfstead Castle began her life as Yard #45, and took approximately three years to complete.