Hello! I have recently purchased 4 SEPTA Horizon coaches (made by Walthers), as well as a few Watlhers tank cars and Athearn engines. They have been plagued by all sorts of problems first off, the Horizon cars in general seem to have a problem with their couplers. I can install the exact same coupler (Kadee#5s with the seperate copper centering springs) in my cars, yet they all continue to hang at different heights, and constantly uncouple. Additionaly the bothe th coupler and the singing coupler pockets in these cars seem to get hung up alot, and the couplers don't return to center. Next, i have just bought a bunch of Gold line 23,000 tank cars, that have these new kuckle couplers that are supposed to look more to scale or something, and they have all the weird problems as well. they seem hesitant to couple together, and they are a pain to couple with most of my road switchers. finally, the Kadee #5s on my Athearn locomotives ( Blue Box SW1500, GP38, RTR GP38-2 & GP40-2) always get stuck. they don't like to center themselves, and i think those copper centering springs are useless. I have a couple Mch Henry and Easy Mates, but lately i've been moving away from them becaus of the plastic leaf springs on the knuckle. so, how do I get these passenger cars working again? Should i replace these couplers, or should i convert the rest of my fleet to these? is there an alternative that works that doesn't need these unreliable centering springs? thanks for your help Chris.