I model ACW (American Civil War) era. Slowly, I'm moving from Horn Hook and Kadee couplers to these Link & Pin units. I tried Gilpin Tram L&P and although the size is more prototypical for HO, the plastic construction doesn't hold up as well as these metal ones. These Alexander pieces are oversize for HO but the Proto look and feel of using them far outweighs the minor size problem.
Screw The Rivets, I Model For Atmosphere.