On a few of my modeling projects, I want to use those RV style Air Conditioners that BLMA sells. They come in 4 packs, and I have bought 5 of the packs.
On the prototype, everything I see shows the engine using 2 of them on top of the cab. Are there any instances where there is only one being used? Since they are sparaticly used by railroads, I wouldn't know where to start.
Any ideas?
Phil