Thanks I did not know that the new Legacy B units have switches to disable the operating couplers that does eliminate the issue GRJ mentioned. I do still think Lionel would be smart to eliminate the operating couplers on the B units especially now that both A units are powered. In other words who will take off a powered A to use a B unit as the trailing unit? They would save a few bucks on the B units and reduce the price also allow closer coupling. The only B units that need a operating coupler is the B unit in a AB set like the new E7 City of LA UP set.