I have 4 of the Atlas F-9s and 2 of the C-liners. I bought the F-9s years and years and years ago and the C-liners off eBay within the last year. I don't have a layout up only a loop of track. I don't run my trains very often and the ones that get run the least are the F-9s and the C-liners. Surprisingly, they all run very well for how old they are. I really like them a lot. F-9s pull pretty good but can't pull a lot of cars. Don't think I've ever pulled any cars with the C-Liners. Sorry, I can't give any advice on the couplers. They have what they came with. They both come up on eBay a lot. Sometimes you can find them at train shows. Prices, I've seen, vary.