I also know that line is an active freight line, so you could run the trips on sundays maybe?
Yes it's an active freight line - which works against you in most cases "We don't want your 'hobby' engine out on the line breaking down and blocking our real train." It's also trackage owned by the NYSW - which in turn is largely owned by NS and CSX - both varying degrees of rabid against any kind of passenger operation on their tracks.
Scotty's point above is very well taken - there are many equal or more interesting locomotives around the country which sit stuffed and mounted because they have no where to go. Being able to see and touch them is still better than shaving with one of them.