How do I choose model train couplers?

Question by buzzard7454: How do I choose model train couplers?
I have a bunch of HO model trains and many have broken couplers or have different ones that don’t match up. I want to replace all of them so they are all the same. What do I need to do to select the right coupler for my trains? I am not asking about which brand to use, but is there something I need to look for in terms of size, style, etc that will fit all my trains (the trains are all different brands)?

Best answer:

Answer by Grgbulldog
I suggest Kadee Couplers. They’re the best.

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