03-04-2011, 09:40 PM
If it were me I would standardize on Kadees. They do not mate with other brands of knuckle couplers, just as the other brands of knuckle couplers don't mate with each other. Kadee has a chart that shows which coupler to go with each manufacturer of rolling stock, but you may have to choose whether to standardize at 1:22.5, 1:29, or 1:32 for coupler height, and then adjust accordingly for your rolling stock which may or may not be of any of those 3 scales. G scale is still a bit complicated, hopefully soon there will be more clear cut standards.
-Dave