I too like the A end view for the same reasons Bryan B noted. For the B end I tried to duplicate the effect shown in a photo of a late Mather AC&Y lease car, highlighting some boards but leaving others untouched. It looked "splotchy", for lack of a better description. Obviously all the boards are weathered to one degree or another but the wash and chalk treatment was not bringing that home. Touching all the boards with the gray pencil and varying the color left behind was an improvement to my eye. I used the burnt ochre selectively on some boards but not others, thinking the gray would stand out better on those not colored again. It seemed to work somewhat.
I tend not to turn weathering into an art form. Not enough time or interest. But I do study prototype photos and try to to figure a technique I can do quickly. A well weathered single sheathed box car holds a lot of inspiration for the artist.
Upon NP Bryan's comment I went back to look at the aforementioned AC&Y car. The paint stuck to the metal better than the wood. I guess that should not come as a surprise. The metal ends are very dirty and the steel frame parts catch the dirt. The steel door seems lighter than the body. Flat surfaces that are washed by rain I guess. My frame parts did not catch the dirt well. Another opportunity for the next go around.
After thinking about it I mixed up the order of the weathering process. It was light gray wash, black wash, pencils, black wash again, airbrush and chalk. A heavier black wash might have helped.
The AC&Y was a big Mather lessor. Sure would like to see a model in N because those U and Z channels would be tough to duplicate as a scratch project.
Thanks for your comments guys.