Thank you both. That is very helpful. I think the set shown on Live Auctioneers may be incorrect with the crane car (and missing work caboose). Unfortunately, I can't tell from this set what might be missing since the entire set of trains from the 2219W set was nowhere to be found. That's why I was wondering if the 706 set might have had an extra car like the barrel car or search light to distinguish it from the 1553W set. Both those cars seem period correct and it would not be unusual for Lionel to offer an operating car in an uncataloged set to distinguish it from the regular catalog set.
John
