Do you use "choo-choo" for describing the train?
Yes, "choo-choo" is used to describe the sound that comes from the horn of a train. So a "choo-choo train" is a train that makes a sound that sounds like "choo-choo". "Choo-choo" is a term only used by children or for children. Ex: Here comes a choo-choo train!
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