A few years ago Atlas bought the O Scale division of Intermountain. These were pretty much the most detailed mass produced kits at that time. Intermountain also produced ready to run versions of the kits with either 2 or 3 rail trucks. The kits contained both 2 and 3 rail trucks.
Atlas "hardened" the kits with metal detail parts in place of the fragile Intermountain parts and eliminating a few of parts that were easily damaged. If you are looking for maximum detail the Intermountain cars are the ones. BTW in the early '90s K-Line offered a scale line using Intermountain cars minus some of the fragile detail.
Here is an Intermountain reefer made from a kit for comparison to your car:
Pete
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