Wow! You surprised me with that photo. Not sure why I have not been able to find much historical information on the Anderson kits on-line or in my collection of old catalogs. I started to hunt in my collection of old MRR magazines or looking for advertisements. Also, have been finding out that the history of hopper cars, their lineage and manufacturers is rather confusing, at least for me in the early stages of learning about these most prevalent pieces of equipment on the rails.
I am wondering if the Anderson hopper kits were intended to represent equipment manufactured after the transition from wood to steel, from gondola to hopper since it is a 50 ton rated car. But then again these could have been pre-war or emergency hoppers that had wood sides but were eventually replaced with steel sides. However this may not be right either because of the diagonal outside bracing on the wood sided cars which the Anderson kits did not have unless of course the diagonals were replaced when the equipment was upgraded from wood sides to steel and thus are post-war.
I originally thought the Virginian hoppers were manufactured by the Virginian Railroad shops however the early steel car designs had their share of problems or short comings. It could be that the best go to or standby reference is the PRR classes as they manufactured hoppers starting with the GG and GLA (USRA two-bay hopper) followed by the H Classes where the GLAs were 55 ton. In any case, I have to do my reading and research on this subject matter before doing any further commenting. A really nice visual reference museum site for PRR equipment showing scans from negatives from relics to the more modern equipment is at:
which brings me to this welded hopper car photo:
and this CGW Hopper I am thinking about building maybe with Anderson kit parts.
And you just have to love this gondola that looks like a cross between a gondola/hopper:
The detail and character is a brass model builders dream, unique in its own right.
As far as the PFE-50 label on the Anderson kit I don't think it signifies Pacific Fruit Express because PFE were all ice boxes on wheels as I don't recall that company having hoppers. My nearest guess is Pullman Freight Equipment however Pullman acronym was always PS for Pullman standard. On the other hand it could mean Pressed Steel Freight Equipment given the release of the kits was in that hopper era neighborhood historically speaking.