Greg and others, the Rannoch Corp. in Texas (owners of the Reader #108 2-6-2) co-ordinate the US reservations. Looks like a great trip. The cost is reasonable if you compare it with other European railtrips where you ride only. Or even Trains Unlimited Tours trips to Central and South America.
The only problem I see is that after a week of running a Polish steamer when you return to an American loke, everything looks backwards!
JB