The Fastest Rail Zeppelin is an upcoming episode.
Hugo goes fast and he is a fastest rail zeppelin on Sodor.
- Donald and Douglas
- Sir Topham Hatt
- Edward (cameo)
- James (stock footage)
- Rosie (stock footage)
- Skiff (stock footage)
- Sir Robert Norramby (stock footage)
- Thomas (stock footage cameo in main episode; narration only; end segment)
- Henry (stock footage cameo)
- Gordon (stock footage cameo)
- Percy (stock footage cameo)
- Stephen (stock footage cameo)
- Philip (stock footage cameo)
- Millie (stock footage cameo)
- Annie and Clarabel (stock footage cameo; end segment)
- Troublesome Trucks (stock footage cameo)
- Captain Joe (stock footage cameo)
- Stock footage from Engine of the Future and Hugo and the Airship are used.
- At the end of the episode, Thomas mentions the events from the twenty-first season episode, The Fastest Red Engine on Sodor, stock footage from the said episode is also used.
- This episode marks the first appearances and speaking roles:
- Hugo's first appearance since Journey Beyond Sodor and speaking role since the twentieth season episode, Hugo and the Airship.
- Jeremy's first appearance since the twentieth season episode, Letters to Santa, his first speaking role since the tenth season episode, Thomas and the Jet Plane and his first appearance in his regular model since the twelfth season episode, Excellent Emily.
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