Atlas Trainman Covered Hopper Question

What loads are carried in the CSX (EX- C&O) three bay hoppers that Atlas has in it’s Trainman line?

According to Atlas:

“The three-compartment ACF® 3560 Center Flow Covered Hopper was designed for the transport of high-density dry bulk ladings of 50 – 60 pounds per cubic foot. About 2,214 cars were built from 1967 – 1972. This Center Flow Covered Hopper transported a wide variety of commodities, including salt, fertilizer, starch, bauxite, and clay.”