noun
a sound made to imitate the noise of a train
interjection
used to mimic the sound of a train
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The train conductor announced the arrival of the choo choo train at the platform.
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I love watching the choo choo train go by, it always brings back childhood memories.
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Let's hop on the choo choo and go for a ride around the park!
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The project is moving forward like a well-oiled choo choo train, making steady progress.