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“Mud, glorious mud!”

A Happy Day for Percy, originally titled Byron Saves the Day, is a Jack and the Pack episode.


Byron is disappointed when his hard work is being ignored. But when Max and Monty's reckless behaviour causes a water pump to burst and Alfie becomes trapped in thick mud, Byron rushes to the rescue and finally gets the attention he deserves.




  • The original title for this episode was going to be Byron Saves the Day, although that title is still listed on Virgin TV Anytime's website.
  • Alfie's line, "Mud, glorious mud!" comes from the chorus of the popular Flanders and Swann song, The Hippopotamus.
  • This episode marks Byron's last speaking role to date.
  • This is the only Jack and the Sodor Construction Company episode where Thomas does not appear.


  • The current title is misleading as this episode is mainly focused around Byron.
  • When Byron is cutting out the trench, his treads keep moving after he stops.

In Other Languages

Language Title
Dutch Een gelukkige dag voor Percy
German Ein glücklicher Tag für Percy

Home Media Releases


UK DVD Boxsets

AUS DVD Boxsets


DVD Boxsets