Hmm,
Hadn't thought of Stonebridge. Interesting. Could you give me an idea of the material that might be appropriate? And what the cost range might be? Would you be doing just the master or could you provide 100-200? I ask because I think many modelers here are not familiar with what you can do on a custom basis and, like myself, would like to know more.
Tim,
On second look, the ship ventilators are probably too big (1/16" square) for a railroad car. I could swear they used to offer smaller ones that flew off the tips of my tweezers into the netherworld about half the time. Only my cats knew where they landed, and they would never tell--the vents were already eaten.