3 Matching Athearn Southern Pacific 50' Gondola with Kaydee Couplers

I recently purchased a rather nice lot of Athearn railroad cars and this is the first of them. They are as the title says 3 matching Southern Pacific gondolas. Normally these came covered but instead these are filled with debris. I think the debris is a nice touch. Perhaps some pieces of rail would be a nice addition. As for the Kaydee couplers I think they are Kaydee. They are the fancy realistic looking couplers seen in the first and last photos.
Matching cars is good as a freight train would carry several of the same type of car as opposed to one of this and one of that A few more would be better but three is good enough for now.