NJ International published a book Chesapeake and Ohio H7 Series by Thomas Dixon around 1980. If you can find a copy it contains detailed information of the development of the H7, their use, and ultimate dispositions by engine.
The 30 engines were sold to the UP in 1945 because the UP needed extra war time power and with the recent deliveries of the H8 Alleghenys and K4 Kanawhas the C&O didn't really need them. The H7's weren't a fit for the UP because they were designed for slow coal drags, not the higher speed service needed on the UP. Also the H7's were worn out with steam leaks and cracked frames. UP scrapped all of them in 1947.
3 H7's went to the RF&P in 1943 for hump service in Richmond, Va. These were scrapped in 1949.
After the war only 11 H7's were left on the C&O. These were used in hump service, pushers, and coal drags between Richmond and Newport News.
As far as the Lionel models go, the 1580 is right for its postwar configuration with the 16,000 gallon Vanderbilt tender and post 1930 lettering. The 1578 lost its 16,000 gallon tender in 1930, replaced by a 21,000 gallon rectangular tender, and then a 12,000 gallon Vanderbilt (4 wheel trucks) postwar. So the Lionel 1578 isn't quite correct with the tender they supplied. Lionel should have offered a C&O version with the rectangular tender as used on the UP version as it is a C&O tender and was common on the H7's after 1930.
Ken