The Sodor and Mainland Railway owned a set of four-wheeled coaches, which were used on the line for passenger duties. After the Sodor and 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 coaches are based on the roofed carriages from the Liverpool and Manchester Railway. Two of them, replicas, now work with the Stephenson's Rocket replica at the National Railway Museum. Stephen's Coaches are also based on these carriages.
The 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.