Posted by cmdrflake on July 24, 2009  The derating and regearing of this and some other passenger sharks resulted in one of the more unusual class designations: BF16z. The "z" showed this was an altered unit. The ultimate in PRR classes: ABF16z, one of the repowered freight shark nose cab units, the boosters were ABF16az. Posted by J Moller on July 25, 2009  Also known as DRS6-4-2000 http://www.railpictures.net/viewphoto.php?id=282247 Posted by Marty Bernard on July 25, 2009  A seldom photographed perfect ABA set. Thanks John.

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