Arleen and Ava are diesel engines who work in the United States of America.


Thomas & Friends

Arleen was seen pulling a goods train through Arizona, where she nearly collided with Thomas, Ace and Nia when they were rolling backwards down the Morenci Loop. Nia apologised to her, but the diesel reassured her that she was fine before the engines then set off again and parted ways.

Arleen and Ava were later seen pulling and shunting trucks at the San Francisco Docks. It is unclear whether or not one of them was the same one Thomas, Ace and Nia met.

Technical Details


The American Diesels are based on the Hudswell Clarke 0-6-0 diesel shunter which worked at the Manchester Ship Canal. No. 4002 Arundel Castle, affectionately known as "Billy", is preserved in working order by the East Lancashire Railway Diesel Group. Sister locomotive No. 4001 Alnwick Castle is also preserved as a static non-operational exhibit at the Winfields Store site at Rising Bridge. Frankie is another member of this class.


The American Diesels are painted blue and orange with gold lining.


Thomas & Friends


  • 2018 - Big World! Big Adventures! (one speaks; one cameo)

Music Videos

  • Series 22 - The Journey Never Ends

Voice Actors

  • Teresa Gallagher (UK/US)
  • Keiko Nemoto (Japan)
  • Jenni Sivonen (Finland)


  • Their models are reskins of Frankie's.
  • One of them shares the same horn sound as Mavis.
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