Lionel site claims 2007 Volume 1 for both the sets and add-ons. I'm not 100% sure it was only shown that one time, but I think it was probably only once. (their listing always shows "most recent" catalog)
http://www.lionel.com/products...-r27-subway-6-31751/
http://www.lionel.com/products...k-8030-8031-6-18378/
-Dave