Horn-hook coupler

Another view of the horn-hook coupler
This is a simple pin coupler, much like those used in the earliest days of railroading.
This is a coupler used of the East Broad Top.

Should I replace my horn-hook couplers with knuckle couplers? Modelers replace their horn-hook (HO) or Rapido-style (N) couplers for two reasons: realistic appearance and operation.

Remember those horn-hook couplers you threw away? Get one out of the trash, check it for flash around the pivot hole, and placing the round pivot end over the bolster pivot, bottom it on the bolster pin.

See also: Coupler, Trucks, Point, Track, Car