Hello Group Members....I model HO and O scale passenger car equipment both heavyweight and streamline. I slice, dice and kit bash all of this equipment. Unfortunately the diaphragms on the cars preclude the use of the Sergent coupler. However, if I were to start modeling the older, wooden, open platform equipment, I'd use the Sergents. In the mean time I enjoy reading the posts and find them to be very informative.....Tom Bavolar