Crossword Genius

Cartoonish train sound (4-4)

Ross

I believe the answer is:

choo-choo

(Other definitions for choo-choo that I've seen before include "Baby train?" , "Chattanooga train?" , "A child's train, sounds repetitive" , "Child's word for train" , "(Childish) train" .)

I've seen this clue in the Sydney Morning Herald.
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