I purchased a set of Lionel Lion Scale freight cars. There are six cars in the set. The problem is the cars keep uncoupling when running the six cars together with no other cars and just the locomotive. Apparently the couplers are not strong enough to pull the weight of six cars and it is not just one car. I bought this some time ago so I can't go back to Lionel. Can someone recommend a set of replacement couplers that I can buy to keep the cars together and that would fit the Lion Scale cars. Thanks
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