i did not preorder these because i could not get a read on the wheel arrangement. a certain wheel arrangement on 3 axle trucks is unappealing to me. once someone here on the forum posted the wheel arrangement on his just received SP units, i went in search of UP units. much to my surprise, they are turning out hard to find. i didn't think these were made to order, but pre orders seem to have gobbled up the supply. would appreciate any source recommendations. i have tried all the ones i usually interact with.
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