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The plural of caboose is cabooses.
caboose
If tail is to rabbit, caboose is to train.
The plural form of caboose is cabooses.
The caboose of something is the back end, so if you say 'the caboose of the train' it is the back car of the train, or if you were to say 'the caboose of that horse' you would be referring to it's rump.