Understand 'caboose' is specific to rail transport, and may not be understood outside this context. He collects old railway memorabilia, including a miniature caboose.
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Historical Aspect
'Caboose' refers to a feature from older trains, which might not exist on modern ones. Museums often display a caboose to illustrate historical train construction.
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Crew's Quarters
The caboose was a workspace and area for train crews, not for passengers. The train crew would spend hours in the caboose going over their plans.