Pat,
Thanks for the response and the information. I have been on this type of treasure hunt before in an ongoing search for some MTH Premier GM&O Madison passenger cars that I would like to integrate into my K Line Chicago and Alton transition period "Alton Limited" passenger train. The cars exist as I have seen photos, but as you point out, extremely rare.
My search for the Lakawanna E-8 engines is the result of collecting the "Phoebe Snow" K Line aluminum streamline cars (with the exception of the baggage) and the the full set of K Line Phoebe Snow Madisons.
As it is my goal to model only the Lackawanna version of the train, I have decided not to buy the Erie Lackawanna diesels that will soon be available. Additionally, I have been watching the Lionel 6-84068 Legacy steam locomotive and waiting for a sufficient price reduction to buy it as a possible substitute for the E-8s. Currently, I run the "Phoebe Snow" cars behind a nicely weathered MTH Premier Nickel Plate Berk and plan to find three or four Nickel Plate streamline cars to add to the consist - creating a version of the Nickel Plate Limited.
Martin