John,
I agree get rid of the operating coupler on the B unit. I went back to the 2019 V2 catalog don’t understand Lionel’s thinking here as all the F B units have one operating one non operating coupler. Where else would you put a B unit other than between two A units especially since Lionel is now doing two powered A units. If anyone is running them as a AB instead of a ABBA or a ABA please let us know.
JohnB