Any small and crowded place: especially the cab of a locomotive (Notes and Queries, 10 S. ii. 214) and the narrow accommodation allotted to workmen, drovers, &c., on railway trains.

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1839.  We have a postmaster in our little village, who is a most thorough electioneerer, and in his little caboose of a post office I found electioneering interferences.—Mr. Preston of So. Car. in the House of Representatives, Feb. 15: Congressional Globe, Appendix, p. 343.

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1859.  Providentially, almost the first man he met in the ‘caboose’ was an old acquaintance, a drover from the West, who was passing down with a lot of cattle.—Knick. Mag., liii. 329 (March).

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1881.  The caboose of the construction train, containing workmen and several boys.—Chicago Times, June 18. (N.E.D.)

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1888.  A caboose drawn by two engines jumped the track at Great Barrington, Vt.—Daily Inter-Ocean (Farmer).

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