According to the Gilbert Factory Service Manual and the parts list all the KC PRR Pacifics and NYC Hudsons through the end of 1958 production used Pul-Mor wheel #XA13A864 which has a permanently installed rubber tire in the outer metal wheel. Beginning in 1959, engines made with the newly introduced split chassis used Pul-Mor wheel #XA14A598 which has a separately installed rubber tire #PA14A869.
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