Kadee body mount couplers & #4 turnout question

 I run all body mounted Kadee's. Most of my rolling stock is 40 ft. cars. I do have a few 50 fters. I have just about every turnout Ross makes. No issues with any of them. Even the 072, 042 curved one backing through. I run Kadee's on my engines. While waiting to make brackets to mount on my tenders or adding fixed pilots to diesels. Don't remember any issues with the factory coil couplers. 

I am a 2 railer, so I am going to guess at this based on my experience.    You probably will not have problems in the yard, especially with 40 ft cars.     You might have some issues with the crossovers with 40ft cars, but I don't think so.

If you are running 80ft passenger cars or autoracks, I would guess you will have problems with the crossovers and most likely in the yard.  

Using numbered switches instead of curved ones (radius) on the crossovers especially, will help because they create a short straight straight section in the "S" curve.   

I would suggest just for appearances when running and some insurance, use #6 switches for the crossovers.      The prototype RRs use much smaller angled switches (larger numbers) on the mains than in yards too.

These are 89' Atlas cars and body mount Kadee. Going through a Ross four way yard track. I do not know what number switch they are, you could call Ross and find out.