Like the low-side gons owned by other y'all railroads (e.g., ACL, SAL),
the Southern's cars were intended primarily for limestone service. In
the only two photos I have of these cars were the loads are visible,
they're carrying crush limestone. However, open-top cars were
versatile and the Southern doubtless used their low-side gons for
anything and everything that would fit in them and didn't require
weather protection.