Walthers 910-46519 HO Scale 50' AAR Single Door Boxcar New York Central NYC 47587 Poland - PKP NMRA RP-25 wheel profile

NMRA RP-25 wheel profile

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Athearn 90202 HO Scale 28' Drop Sill Parcel Trailer UPS No Shield 284499

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Walthers 910-46519 HO Scale 50' AAR Single Door Boxcar New York Central NYC 47587 Poland - PKP NMRA RP-25 wheel profileWalthers 910 46519 HO Scale 50' AAR Single Door Boxcar New York Central NYC 47587 The Association of American Railroads had been trying to set design standards for freight cars starting in the early 20th century. The early designs were not widely embraced. Many railroads preferred their own designs. By the time the 1937 AAR boxcar was introduced, this had begun to change as each new design standard provided higher capacity, lighter, more durable cars.