If you're referring to the wood ore cars,DPL has a great shot at Waldorf after some of these cars went to the Argentine Central. It's an overall view of the town site, but the original photo has reasonably good detail of the ore cars. There's also a good side shot at the Utah State Historical Society (photo #669, negative #27986) showing the ore cars on a trestle.
I've started drawings of these cars, and have completed drawings of the C&N's other freight cars - based on the boxcar in Golden, remains of a gondola at Sumpter and photos.