Pronunciation IPA (key): /kəˈbuːs/ Audio (AU)(file) Noun Singular caboose Plural cabooses (countable) A caboose is the last car on a railway train. In past days, they were usually painted a bright red. I love trains! I always wanted to ride in the caboose when I was a kid!Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads