Andrew reminded me that the early CP cars were a bit redder than the later cars; switching to more of a brown around 1868. So, I repainted the boxes, added an even earlier box with block lettering, and added a set of later boxes in the brown. Here's the early box; all cars are now on the DLS.
I also made a set of UP boxcars. The details are based on photos of boxes 650, 932, and 952. I guesstimated the dimensions, so these may change if / when new data comes along. these cars are on their way to the DLS and should be available in a day or two:
I'll probably give the CP flats the same treatment.