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Rosie's Terrible Mistake is the sixteenth episode of the sixteenth season.
- Bill and Ben
- Bash and Dash
- Sir Topham Hatt
- Mavis (cameo)
- Henrietta (cameo)
- Rocky (cameo)
- Harold (cameo)
- Captain (cameo)
- Cranky (cameo)
- The Knapford Stationmaster (cameo)
- Farmer McColl (mentioned)