Sam I didn't notice the difference until I put the B unit on the shelf between my 2 A units, and yes, its a huge difference when running them together. Also, that coupler really isn't any longer, it's because there is NO diaphragm on that 1 unit so it makes it look longer. My AA units don't have diaphragms either, so I thought the same thing at 1st.
Over all it's a huge screw up by Lionel with a Legacy unit considering the TMCC units have much better spacing.
JDaddy, no problem...Marker and Sam have excellent looking units