It was probably included in the 2251W set. This set included the 2331, 3359 operating dump car, the 3562-50 yellow barrel operating car, a 6414 Evans auto loader car, a 6464-275 State of Maine box car, and a 6517 Lionel Lines bay window caboose. If you can find a copy of the 1955 Consumer Catalog, there is a picture of the set on the front cover right under the title.
Hope this helps.
Jim
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