Is there a book or website that can provide item numbers for follow-up passenger car(s) or a set of cars that match earlier releases? For example, Lionel in one catalog would issue a set consisting of an engine along with four-passenger cars. One or two catalogs later, Lionel would list additional cars to match the set. How does one find the matching set numbers 10 to 20 years later?
Thanks in advance for any insight you can provide.