if the N PRR truck is the same as what Red Caboose in HO calls the 2D-F8 truck,
it is actually an ARA TYPE-Y truck,PRR called them 2D-F4,but after a year or so
switched to the Improved V-9307 sideframes.
and it is only one version of the ARA TYPE Y,there were several different versions
by different Foundries.
so the Truck is usefull for some 1920s cars besides PRR cars.
Spikre