Hi,
I am not sure of the specifics, but what I recall is that the C&TS had 2-3 ex-Butte Anaconda and Pacific standard gauge ore cars with narrow gauge trucks. for many years.
I think similar (if not the same) type items were used at the Loop.
I made the same assumption that they were ex-EBT in the early 1990's. The only problem I had was that it did not seem right. I had a sore forehead when I learned the difference.
I also seem to recall that the ore cars were very unstable on the narrow gauge trucks.
Doug vV