Here is a picture of the sleeper from the 5 car set as a reference. The sleeper in the add-on set is named Tunkhannock and the coach is #1319. These are the second issue of Weaver Erie Lackawanna 20" cars from the year 2000 with green window tints and redesigned grey painted trucks with round uncoupling pull tabs.
I might consider purchasing a 2-Rail add-on set or acquiring another 3-Rail 5 car set and the 3-Rail 2 car add-on if you have both sets and don’t want to break them up to sell them.
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