A Bad Day For Harmood is a Potential Plotlines episode.
Skarloey is one of the oldest engine on Sodor. One day, Thomas brings a new engine called Harmood to the Narrow Gauge Railway and is rude to Skarloey, Rheneas, Sir Handel, Peter Sam, Rusty, Duncan, Freddie, Duke and Mighty Mac. Mr Princpal sends Harmood to work first. But Harmood calls the rear coaches cattle trucks. He tells Gordon that he has a bad additude. Then he arrives at the top station and derails. Harmood is punished by Mr Princpal for derailing himself. Mr Princpal takes Harmood's wheels and leaves his cab.
- Rheneas (non-speaking role)
- Sir Handel
- Peter Sam (non-speaking role)
- Duncan (non-speaking role)
- Fearless Freddie
- Mr Princpal
- Agnes, Ruth, Lucy, Jemima and Beatrice
- Harmood has Sir Handel's Season 4 whistle.
- When Harmood derails, his whistle blows.