Re: NG interchange

Keith,
Check some of the interchange records in the Museum. I know that RWR had some showing C&S and D&RGW interchange. Check the RGS ones, too. If you don't count the fact that the RGS was at one time part of the D&RG, the majority of their freight moved in interchanged equipment. Miller and Fuller, Jr. moved a lot of freight in D&RG equipment.
As Ron said, there were lots of foreign cars on other railroads. There is a photo at the CHS of a C&N-W boxcar on the head end of a C&S train heading up Clear Creek Canyon.
Remember that the D&RG ran down Chalk Creek Canyon while Marshall Pass was being built. The C&S did switching on the Blue River Branch when the D&RG gave up regular operation, and vice-versa for the line from Quartz to Baldwin.
The Argentine Central operated with mainly C&S equipment.
Just because you don't see a photo of it, doesn't mean that it didn't happen.
Remember, the bulk of the amateur photos came after the 1930's and the era of lots of interchange was over by then. Except when it came to leasing C-19's.
Rick Steele