I have quite a bunch of Intermountain 1937 AAR box cars with Youngstown steel doors. As much as I love the plastic kits, as poorly modelled are door lever and lock. With the prototype information provided by Gene Deimling I was able to draw correct scale parts in 3D.
I've printed these in resin on my trusty Elegoo Saturn printer using standard settings. I really like the outcome, they look better than I thought, the parts are really small but they certainly add to realism and make a huge difference on the model.
Should you be interested, I have uploaded the files to my website www.trainkitchen.com/downloads
The design is good for single doors but I just have this double door project going on so I put it in place with a little trimming of the backside of the prints. This is so much fun!