Pullman cars used for Pullman Sleeping car service were named and not numbered, with some exceptions for tourist cars and some lightweight cars (notably on SP, NP and NKP). The choice of a number would most likely indicate an office car. On many roads, office cars with easy to remember numbers like 200 were assigned to fairly high ranking officials.
Since 200 would have been built out of wood (a given from the construction date, but also verified by the Pullman plan number in the 1000 series) it would likely have been replaced in first-line service sometime around or just after WWI by a car constructed of steel. Not sure what MP's practice was, but SP and AT&SF would have handed the car down to someone less important, say a division superintendent, probably renumbering it in the process.
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