While I would like to see a 470 engine on the C&TS someday, I would really only pay to see it on something that was similar to the San Juan. Since they don't have any such cars on the C&TS, I would be more apt to spend my money doing a charter with a 470 on the D&S, which does have some authentic cars, and can re-create a Silverton Mixed.
On the flip side, a K28 might be neat on a freight on the C&TS, but I think most folks consider these as passenger locos.
The winter photo special idea sounds really nice. Wish I lived closer! I shudder to think how much trouble I would have getting there in February!!!
Just my 2 cents.
Greg Scholl
[www.gregschollvideo.com]
PS..John, despite what I think, the trip would probably sell-out cause most folks don't care that much about loco or coach authenticity. Just look at the TUT trips which always seem to sell out.