DesPlaines Hobbies sells etched metal screen upgrades for the Red Caboose GP9s.
Unfortunately the shop’s web site does not have a photo to give one an idea of what the parts look like. Since I ordered a sample, here’s a photo to give anyone potentially interested an idea of what would be received. I usually reduce the resolution of photos I post here, but for close examination this is full camera resolution. Double click on the photo to enlarge it.
These are not as nicely detailed as ones that Ed Nadolski designed for his P-48 GP9, discussed some years ago on therailwire.net. His work is sheer poetry. These would not quite look right if the shutters were left flat. Each vane appears to be designed to be twisted to simulate an open position. A good GP9 reference photo can reveal which way the vanes tilt.
I have a number of GP9 kits with P&D drive kits and DesPlaines brass frames. I’m debating whether to mount a Tang Band 1931 speaker mounted through the middle of the fuel tank and air tanks, firing down, or a 1925S module above the rear gear tower, firing up through the fans and sideways through these screens. The 31 would offer deeper bass response and move the sound stage towards the center of the locomotive, where it should be. On the A&O a lot of the track is chin-high to facilitate “in your face” rail fanning. But the 25 would leave the fuel tank intact so that it can receive a full pour of Cerrobend for low-slung weight.