In the clip below about the making of the film they mention building the two locomotives from scratch. Haven't see what is the status of them now after the filming. Would hope that someone had the sense to save them for possible future use and that they used CGG for the wrecks in the movie!
http://www.youtube.com/watch?v=glSY2m8KThQ#at=101
Too bad some of these filmakers don't have a passion for restoring real steam locomotives for public or private use. Imagine having $250 million to spend on No 611 and a few others!