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The Collaborative International Dictionary
choo-choo

choo-choo \choo-choo\ n. a train or a locomotive; -- a child's word. [Baby talk]

Douglas Harper's Etymology Dictionary
choo-choo

Child's name for "steam-engine locomotive," 1895, echoic (choo-choo cars is attested from 1891).

Wiktionary
choo-choo

n. 1 (context childish English) The sound made by a steam locomotive. 2 (context childish English) A railway locomotive. 3 (context childish English) A railway train. (Also called a choo-choo train)

WordNet
choo-choo

n. a child's word for locomotive

Usage examples of "choo-choo".

Jake's mind flashed back to his Final Essay, with the picture of the Amtrak train on the title-page and the words choo-choo written over and over again inside.

It's just an awful choo-choo train, and its name is Blaine the Pain.

Elsewhere were miniature choo-choo trains, zoom-rides, and toy air -- planes whirling about a pole.

Elsewhere were miniature choo-choo trains, zoom-rides, and toy airplanes whirling about a pole.

Theroux has already written two whole books about trains, but the choo-choos and chuff-chuffs feature prominently in this one too.