Some # can be punched in the Lionel parts web and may shed some light. The older version actually told you all the products that used that part, but Lionel disabled that function long ago. G
For what it's worth, I've done this to sort of do what you want... once you have the part number, you can enter it into google as <part number> site:lionelsupport.com like:
Then if you click on the "images" tab you get a view of all the drawings it's included in.