from W3:

caboose Main Entry: ca·boose
Function: noun
Inflected Form(s): -s
Etymology: probably from Dutch kabuis, kombuis, from Middle Low German kabuse
1 also camboose \kamb-\ a : a deckhouse where cooking is done : a ship's galley b : an open-air cooking oven
2 dialect : HUT
3 : a freight-train car usually attached to the rear of a train mainly for the use of trainmen in the performance of their duties although sometimes used to transport passengers, especially livestock caretakers