I made myself a little height/body chart for the cast in the Sodor, UK AU. each character has a brief description of their body types below. ^^

Duck - Almost shaped like the number eight on his engine, Duck has some fat, ranging from his age of being around the late 30s/early 40s, to his occasional appetite for desserts such as ice cream and chocolate cake. He remains fit around his arms due to working on the railway and the farm in early life.

Donald - Despite being 30 years old, Donald remains in his twink-like body. He had been thin since he was a young boy, but that didn't let him down whenever other people tried to tease him about it.

Cecil - Cecil's body is almost skeletal, but he has fat around his abdomen. This is due to him not eating a full meal and downing wine and Guinness.

James - Lucky for James identifying himself as a transgender heterosexual man, he was able to have his breasts removed. His mastectomy scars can be seen.

Thomas - Thomas, being the mascot and popular, really useful worker on the North Western Railway, lives a fit life. That includes having a healthy diet of meat and vegetables as well as dairy products.

Daisy - Similar to Thomas' diet, she also consumes a healthy diet. Daisy also has some muscle despite her flexible shape, which would attract male patrons at the Ivory nightclub who are into muscular women.