Bill Couser was a well-known traction guy. Less well known, he was a pioneer of what was then called 1/4-AAR, which became today's Proto48. In the '70s he marketed resin kits of several permutations of the 1937 AAR boxcar; single-door, double-door, and end-door in both 40' and 50'. His masters were works of art; every rivet was made and positioned individually.
He sold them under the Nickel Plate Products moniker (no idea whether he had any association with the HO brass importer of the same name though certainly no association with Canter/Vaughn's Nickel Plate Models of the 2000's). They came like this:

A very solid straight one-piece body, wood strip roofwalk, and lost-wax brass detail parts. Instructions were comprehensive.
I have these running on the railroad, and they certainly need no apology compared to the Intermountain 40' car, blow both the Pecos and later Lionel 50' plastic scale-plate car out of the water, and hold their own with brass.


Bill was as neurotic (in the positive sense of the word) as they come when it came to fidelity, the cars are very well engineered and a pleasant build. I'm working on a double-door 40' as I write this, done in CN and only needing a few repairs, then blending and weather. That 50' kit is in the queue to build, too.
Those years were interesting ones, and Bill was but one of the characters in that play that are in some danger of being unfairly forgotten.