> Although both truck sets are very nice, they are quite different, in both
> the way the side frames are attached to the
bolsters, and the SSA side frames have raised lettering, whereas the PRS's do
not. The PRS's came with plastic wheel
sets; the SSA's are metal.
PRS offered three kinds of trucks under the box cars: AAR cast steel sideframe
trucks with spring planks- these were the
first style available and were typically preassembled by John because of the
difficulty involved; National B-1 trucks and
ASF A-3 Ride Control trucks- these came later and used a notched stud snapped
into the truck bolster, which provided
equalization in addition to far easier assembly, while a lower parts count may
have reduced the cost as well.
DPH had tooled their own ASF A-3 Ride Control truck prior to purchasing PRS
from John. There are different casting
marks on these compared to the PRS ASF A-3. They use the same basic
sideframe-bolster connection; IIRC, Ron may
have said the same fellow cut the tools. The upcoming SSA PRR 2D-F8/ARA Y
truck is also similar in this respect.
PRS originally had plastic wheelsets, but later put in other makes of metal
wheelsets. I know that when John used SHS
wheels, they were shorter and consequently offered too loose of a fit. NWSL
wheels were fine.
Earl Tuson
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