Stephen Topham Hatt is Sir Topham and Lady Hatt's grandson and Bridget's older brother. In The Railway Series, he took over his father's role as controller of the North Western Railway in 1984 and became Sir Topham Hatt III in 1997.
He later appeared in the following books as the Fat Controller:
- Season 1 - Thomas and Gordon (cameo), Thomas' Train (cameo), Thomas and the Trucks (cameo), James and the Coaches (cameo), and Toby and the Stout Gentleman
- Season 2 - Saved from Scrap (cameo), Old Iron (cameo) and Wrong Road (cameo)
- Season 3 - Percy's Promise (cameo), Time for Trouble (cameo), Gordon and the Famous Visitor (cameo), Diesel Does it Again (cameo), Thomas Gets Bumped (cameo), and Edward, Trevor and the Really Useful Party (cameo)
- Season 4 - Bulldog (cameo), Peter Sam and the Refreshment Lady (cameo), Steam Roller (cameo), Rusty to the Rescue (cameo), Bowled Out (cameo), Henry and the Elephant (cameo), and Bulls Eyes (cameo)
- Season 5 - A Better View for Gordon (cameo), Bye George! (cameo), Baa! (not named), Thomas and the Rumours (cameo), Toby and the Flood (cameo), Toby's Discovery, Something in the Air (cameo), and Sir Topham Hatt's Holiday
- Season 6 - No Sleep for Cranky (cameo), Harvey to the Rescue (cameo), James and the Red Balloon (cameo), Percy and the Haunted Mine (cameo), Thomas, Percy and the Squeak (cameo), and Edward the Very Useful Engine (not named)
- Season 7 - Emily's New Coaches (deleted scene cameo), Snow Engine (not named), Rheneas and the Roller Coaster (cameo), Harold and the Flying Horse (cameo), and Three Cheers for Thomas (cameo)
- Tomoko Naka (Japan; first season only)
- Hiromi Nishida (Japan; Toby's Discovery only)
- Chisato Nakajima (Japan; fifth - sixth seasons)
- Kumiko Izumi (Japan; seventh season only)
- In the magazines, he and Bridget have a friend named Marcus.
- In the magazine story, The Hallowe'en Special, it is said that Stephen and Bridget live on the Mainland and only come to stay with Sir Topham and Lady Hatt every so often.
- In Saved from Scrap, Stephen's model was used as one of The Vicar's sons.
- From the third season,Stephen wore a green sweatshirt instead of a jacket and tie.
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