I'm pretty sure this is one of the many Mel Price repaints. When the Lionel 17900 Santa Fe and the 17901 Chevron unibody tank cars were issued, Mel had some of them repainted into other paint schemes. This is likely one of them.
i think you are correct , the box it came in was a chevron tank car 6-17901, the paint job looks factory done , i got it for 23.00 bucks , i bought it to go with the meta box car of the same color, came on it by chance . thanks for the info techman