S.C. Ruffey is a troublesome truck who likes to play tricks on engines and is the leader of the other Troublesome Trucks.
- Season 1: The Trouble With Trucks,Frank and the Trucks, and A Scottish Tale (cameo)
- Season 3: Double Trouble (does not speak),
- Season 4: S.C. Ruffey and The Foolish Freight Cars and Rickety's Revenge
- Season 10: Scruff and S.C. Ruffey
- Season 12: The Importance of Being Billy (cameo) and Truckus Ruckus
- Season 13: Sam I Am (mentioned)
- Season 14: S.C.Ruffey's Sweet Tooth