I believe they started operating in July of 1976.
The track follows the ex=Pere Marquette right of way. You can clearly see the right of way leading on past either loop.
There was the old loop that was railbanked in I believe 1991 (or therabouts) and I think that #464 was taken out of service in 1994, for restoration...
I could be wrong, I am just going from what I have read.
So, when do we get to see the photos?