Actually I was wrong on my post. The last time I was there was not 97, but rather 1994. Previous to that it was 1985, but I can't say if I visited the roundhouse that year. So your sighting in 91 means it probably was put in there in the late 1980's! We did the roundhouse tour in 1994 and shot inside and out of the whole place, but the video has never been used anywhere. I remember 493 and 498 in there, two of the 3 locos I saw run in 1968. 493 had been arranged to tour the cab which was nice.
Greg