- 1996 (thin wheels)
- 1997 (thick wheels)
- 2006 (new design with removable ballast and "rusty" orange wheels)
- 2017 (black wheels, hollow plastic body, pop-up feature, only in Demolition Team)
- 2018 (new face, spark decorations, only in Dynamite Ryan)
- The 1996 version had static plastic ballast, whilst the 2006 variant had a magnetized, removable load of ballast in the form of a triangular prism.
- The 1996 and 2017 models feature black wheels, while the 2006 model used orange wheels to represent rust.
- There is a prototype S.C. Ruffey in the 1996 Yearbook with flat magnets and a much smaller face.
- S.C. Ruffey's 2006 model has a slightly longer Chassis than other similar trucks.
- S.C. Ruffey's 2017 model has the ability to eject cargo with the push of a button. As a result, it is made entirely of plastic.
- The first prototype of the Troublesome Trucks and Sweets depicted S.C. Ruffey as the Sodor Sweet Shoppe Troublesome Truck.
- S.C. Ruffey's 2018 Thomas Wood model is the only item in the Thomas Wood range with a painted chassis and as such has no exposed wood.