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This article is about the episode. You may be looking for the rolling stock.

“Chug-Wash soap cuts through the grime! Sparkling clean; it gets in no time!”

Scrub-a-Chug, also known as Scrub-a-Chug Chug, is the fourteenth episode of the second season.


Chatsworth notices that it is getting very dirty inside the underground tunnels. Eddie and Hodge are sent to clean the sludge out of the tunnels, so they refill the Scrub-A-Chug, a piece of rolling stock that brushes the tunnels clean, with soap. Their work is interrupted when they get called away on an emergency. Wilson decides to be helpful by finishing their chores.

Unfortunately, he accidentally replaces the Chugwash soap with Chugwash sludge when Chatsworth needs a wash and when he tries to clean the tunnels with the Scrub-A-Chug, he ends up making an even bigger mess! Happily, he figures out a way to use the Chugwash soap with the Scrub-A-Chug, and when Eddie sees the sparkling clean tunnel, he's thrilled.


Rolling Stock






  • Going by production order, this is the thirteenth episode of the second season.
  • This episode marks the first for a few things:
    • The first appearance of the Scrub-a-Chug.
    • The first time Eddie wears a visor, ear protectors and helmet and uses a chainsaw.
    • The first episode to air in the UK after the series underwent a two-month hiatus.


  • Due to Koko being an electric engine, she shouldn't be able to move her wheels when she's derailed.