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I'm no SP person, but I do know what it is. A repeater car was used to pump more air into the train line brake system for long trains. It would be put in the middle of a long train (I'm pretty sure, it might have been end). Since the SP had plenty of grades, they would need multiple brake applications and releases, often times exceeding the capacity of the locomotives' pumps and reservoirs. Hence, the repeater car, that aided in regenerating the air pressure. No idea how they worked, though.
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