Bill Daniels wrote:

I know of NO cabooses that rode on 36" wheels... as has been mentioned previously 36" wheels are for passenger cars (due to high speed and the weight of the car) and heavy (>100 tons) freight cars. Cabooses did not fall into either category.

On the SP, all cabooses to my knowledge had 33-inch wheels. When assigned to fast trains like the "Overnight," a caboose with steel wheels was required, rather than the cast iron of older cars, but that was all. Passenger coaches, which all had steel wheels, were also acceptable for those caboose assignments.

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