You are looking at the harder to find of the two auto loader cars. This is the one with plastic AAR trucks and two disc style couplers. It has the four cars with chrome bumpers. This one is variation B in your Greenberg. And check out the BOX!
As you can see, this one is complete with cars and box.
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1959-60
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With cars with chrome bumpers
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With AAR trucks
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"6414" on the left side of "Lionel"
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Solid orange perforated box
Condition: One step has some discoloration. Light scratches and surface rust in places, all pictured.