Donald and Douglas are Scottish twin tender engines. The Fat Controller had ordered one of the engines, but received both instead. They enjoy working in the snow as well as pulling goods trains.
When Donald and Douglas first came to Sodor, they had lost their numbers. So Sir Topham Hatt gave them numbers (9 and 10 respectively). They caused some trouble when Donald had crashed tender-first into a Signal Box and when Douglas destroyed a brake van while helping James with a goods train. However, Sir Topham Hatt let them stay due to how well they worked with goods trains and in snow thanks to a deputation after spotting Henry in the snowdrift.
- HO Scale
- Donald and Douglas' tenders lack water tanks, a mistake the TV Series models also made.
- Donald and Douglas do not have cab roof rails.
- Donald and Douglas share the same facial expression, so the eye brows on both twins are painted differently to tell the twins apart easily.