I only wish they would do a more realistic job with the valve gear. Especially the union link and combination lever. Lionel's combo lever is a bent piece instead of a straight piece as per the prototype. To my eye it ruins the valve gear. I readily substitute these pieces and it's a bite in the rear. As others lament it is shame not to make a 2 rail version, or at least offer drivers and wheels to convert.
Having said all of the above, I think it is a magnificent effort on the part of Lionel and I thank them for it.
Ron H