Have been following this discussion with keen interest. Having both 18" or 21" aluminum passenger cars available to the consumer is a great idea and Scott is to be commended for coming up with the idea and bringing it to the marketplace. Smart move! I know a lot of O scale train operators are very pleased with his announcement. While not currently interested in GGD passenger cars in particular I am specifically interested in purchasing a 3rd Rail 2rail ATSF big dome passenger car. Very few of these unique passenger cars were made but due to my finances I was unable to purchase one at the time - big mistake on my part. Since then I haven't been able to locate one anywhere on the secondary market. Even considered converting a 3rail version if I found one but eventually gave up on the idea. So please Scott consider making them available again sometime in the not-to-distant future. Please!