Bill Welch wrote:

I know there are two versions of the three bay Pullman PS2 under
development, one being the early version (early fifties) and other beig
a later version. Is the Athearn version the original version?

As I'm sure Bill knows, the "PS-2" designation applied to all the P-S covered hoppers, regardless of number of bays or cubic capacity. Even for three-bay cars, there are PS-2 designs of quite different sizes. If I have been correctly informed, the two forthcoming models are of different sizes.

Tony Thompson Editor, Signature Press, Berkeley, CA
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