This model dates back to the early days of N scale (late 60s / early 70s), and has had various importers over the years - Aurora/Minitrix/Model Power first, Con-Cor later on.
I'm not entirely sure what prototype this model might be based on, but if you go by the evenly spaced ribs it looks a lot like the 100T / 2929 CF cars built by Pullman-Standard in the 1960s -
Unfortunately, the uneven hatch spacing on the Con-Cor model is more in line with PS's earlier 2893 CF cars. So, I guess no matter how you slice it, it's not quite right for either version.
Roco also tooled a "trough hatch" version of this car for Con-Cor. It represents a prototype built by Pullman-Standard starting in the late 1950s -
