I've been converting my rolling stock to Kadee body mounted couplers. They need a decent radius curve and you lose the feature of them working with electromagnet uncouplers. But I believe the benefits outweigh the disadvantages. They will mate with every 3 rail coupler I've tried. You needn't convert every car.
I've never liked the Weaver setup. The cars do sit high. By removing the coupler and just fastening the truck like the 2 rail version. The car will be noticeably lower. The holes are already in place for the body mounted Kadee's. Part of the problem with the drooping coupler is the weight and length of the diecast version. It also isn't self centering seeing it pivots with the truck and both the truck and coupler share the same mounting bolt. It must be loose enough for the truck to pivot. Often times this looseness causes the coupler to droop. It's more noticeable in the heavier die cast version. If the cars aren't being used in switching service. The Kadee's can be added to the Weaver cars and you can couple them to transitional cars on each end with standard 3 rail couplers.
Bob Nelson
Modeling the "Fargo Area Rapid Transit" in O scale 3 rail.
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