Thanks again, Chris, for this further advice.
One other question you may be able to help me with. I wonder to what extent is is possible to wander around the park grounds and gain access to the lineside at some of the remoter spots. I appreciate that the trestle and the Forest Outpost are out of bounds except for the evening photo special but there's three miles or so of other track and you mention going up to the 4+ per cent Fort Boone grade. I'd enjoy a ride but my main interest is photography. I guess that much of the line runs through woodland and so it may only be more or less head-on shots that are possible but this would be no bad think as the Tweetsie lettering on the loco and tender wouldn't then be very prominent! Again, any thoughts you have on this would be very much appreciated.
Best wishes,
James