Railway Prototype Cyclopedia 19 does list the trucks, see the caption on the top photo of page 28. Cars 28000 to 28374 were equipped with Barber S-2 and 28375 to 28749 used ASF A-3. NP 28757 and 28762 must have had trucks changed out. The Northwest Railway Museum has NP 28129 and 28417 and both have their correct trucks.
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--- In STMFC@yahoogroups.com, Tim O'Connor <timboconnor@...> wrote:
It would be nice to know which cars had which. I have photos of
28151, 28198, 28318, 28757, 28762 and all of them are riding on
the Barber trucks. The NP equipment diagram is no help at all. :-)
> Some of these cars also had ASF A-3 Ride Control trucks. See the builder's photo
> of NP #28464 in the September 1994 issue of Mainline Modeler.
> Brian Leppert
>> Bill, the NP War Emergency box cars were delivered with Barber Stabilized S-2 trucks.
>> Branchline offered those trucks in HO, and though they are now out of production you
>> may be able to find some. Currently in production are the Exactrail ET-114 Barber S-2s.
>> Richard Hendrickson