The box is mislabeled as 6-29606. The correct item number is 6-29206. There was a magazine I believe named The Toy Collector that had the full story on the car. It is the first vapor records employee car and is quite difficult to find. The later 29218 was made in much larger numbers. Took me quite some time to find the 29206 where as the 29218 is plentiful.
One other item I just remembered, a fellow OGR member and Lionel Modern Era guru @PaperTRW wrote an article that appears in the 1999 TM Book: Lionel Price & Rarity Guide Vol 2: 1970 - 1999.