According to Don Thompson, the PS-2 two-bay covered hoppers were based on the Southern Pacific drawings of the 1957 cars ordered from Pullman Standard (drawings supplied by the late Lee Johnson).
This was the first project S-Helper Service did without the collaboration with American Models (per December 1995 NASG Dispatch notice by Ron Bashista).
PS-2 Operator's Manual (PDF). This was from the sixth run of the car. Note that the pages are oriented vertically, so use the reader software application to rotate them by 90 degrees.
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