My best guess is that I will probably use both types due to differences in some cars and engines......
.....it i neat to see the On3 couplers in place as they are so much more convincing than the couplers that are so much smaller than scale
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I love Kadee couplers in general and have used them in N, HO and O, but is there really any comparison between them and San Juan products? Outside of potential operational considerations, I would think the San Juan couplers would be superior in every aspect.
On3 is another one of those gauges I find fascinating, but at this point I'm too invested elsewhere to do anything but dabble in it.
San Juans are better looking
I converted all my non San Juan/ AMS equipment to Kadee On3 couplers at On3 height. I had all my Bachmann locos modified also with the exception of the 2-4-4-2 which could not be done. For the 2-4-4-2, I use a transition hopper with Kadee's at one end and the Bachmann HO coupler at the other,
I found the Kadee's work better than the Evolution's - on my layout...
Picture of the transition Bachmann hopper:
Pictures of a converted car and non-converted:
Photo of 2 converted Bachmann cars coupled together:
HTH!
Sure looks good!!!!
I am going to go with the Kadee On3 807 coupler.
Good decision!! 
I had good advice
NG Erie boxcars??
per se not prototypical but the erie did operate "Erie Narrow Gauge" lines near and in Bradford, Pa.
Working on tank cars (On30) for American Extract Company
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