The Flour Mill was introduced in the fifth/third series and started out very small. By the eighth series, due to increasing demand, it expanded its operations with more buildings.
| Locomotives | Steam | Edward | Nia | Adam | Porter | Albert |
|---|---|---|
| Diesel | BoCo | Derek | Salty | Philip | Melissa | |
| Rolling Stock | Coaches | Aurora, Ariel and Anna | Francis, Beth and Tiffany | Victoria and Helena | Branch Line Coaches | Express Coaches |
| Trucks | Quarry Trucks | |
| Non-Rail Vehicles | Trevor | Big Mickey | Cranky | Carly | Reg | Fly | |
| People | The Vicar of Wellsworth | The Mayor of Sodor | The Dock Managers | |
| Affiliates | Sodor China Clay Company | Bill and Ben | Timothy | Marion | Sodor Shipping Company | |
| Locations | Wellsworth (Vicarage Orchard, Yards, Engine Sheds) | Crocks Scrap Yard | Suddery (Island Records Office, Castle, Junction) | Brendam (Docks, Canal) | The Fenland Track | The Flour Mill | Lower Suddery | Sodor Animal Park | Dingley Hall | Upper Brendam | Sodor Toy Factory | |