This section is for characters who only or first appeared in the Railway Series, listed in chronological appearance. For characters that first or only appeared in the television series see: Minor Human Characters in the Television Series.
- Humans
- Awdry-created characters
- Railway Series characters
- Railway Series-only Characters
- Male characters
- Female characters
- Staff
- The Mainland
- North Western Railway
- Mid Sodor Railway
- Ffarquhar Quarry Company
- Bluebell Railway
- Thomas' Branch Line
- Skarloey Railway
- The Main Line
- Stanley's Branch Line
- Talyllyn Railway
- Edward's Branch Line
- Visitors
- Farmers
- Minor Characters
- Minor Antagonists
- Characters voiced by Rachael Miller
- Characters voiced by Keith Wickham
- Characters voiced by Rob Rackstraw
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