The Sodor & Mainland Railway owned a set of four-wheeled coaches, which were used on the line for passenger duties. After the Sodor & Mainland Railway went bankrupt and the North Western Railway was formed, it is unknown what happened to these coaches, but they were most likely scrapped.
The Sodor & Mainland Railway coaches are based on the four-wheeled roofed carriages that were used by the Liverpool and Manchester Railway. Two replicas of these coaches have been produced and are owned by the National Railway Museum, where they are used with the Stephenson's Rocket replica. Stephen's coaches are also based on these carriages.
The Sodor & Mainland Railway coaches' livery is relatively similar to that of their basis. They are painted yellow and black, and appear to have "S&M" written on their sides in yellow and red lettering.