The term "baby-talk choo-choo" refers to the sing-song way in which children often refer to trains or railroad tracks. This phrase is often associated with young children who are just discovering the joys of motion and locomotion. There are many synonyms for this term, including "infantile train talk," "toddler train-speak," and "childish railroad babble." These phrases all describe the same basic concept, which is an affectionate and playful way that young children talk about trains and transportation. Whether it be a toy train set or the real thing, children love exploring the world of trains and finding new ways to express their excitement and wonder about this fascinating mode of transportation.