To add to your list. Lionel also produced a diecast hopper for every fallen road. They are listed below. The Grouping is how they were sold in boxes with that set #.
Norfolk Southern Heritage Diecast Hopper Set
6-17718 (Mono, PC)
6-17799 Penn Central, 6-19392 Monongahela
6-17775 (SAV&ATL,NYC,VIRG)
6-17778 Savannah & Atlanta, 6-17790 NYC, 6-17797 Virginian
6-17779 (CEN of NJ,LACK,ERIE)
6-17780 CNJ Terminal, 6-17781 Lackawanna, 6-17782 Erie,
6-17783 (WAB,READ,ILL TER)
6-17784 Wabash, 6-17785 Reading, 6-17786 Illinois Terminal
6-17787 (SRR,NS,NP)
6-17777 Southern, 6-17789 Norfolk Southern, 6-17788 Nickel Plate
6-17791 (NW,PRR, INT)
6-17792 Norfolk & Western, 6-17793 Pennsylvania, 6-17794 Interstate
6-17795 (COFGA,CON,LV)
6-17776 Central of Georgia, 6-17796 Conrail, 6-17798 Lehigh Valley