Have found three models of this series so far. Sounds like the one you have is the Kadee N scale. Weaver made one in O scale and back in the 70's there was a set of 3 in HO using the Train-Miniature offset hopper. All were Oxide Brown twin offset hoppers. Athearn announced twin bays about a year ago but they were black and are not listed on their site. They list a ribbed two bay lettered for the USRA cars of the early 1900's.
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