That explains a lot. Madacy does everything under the sun and my guess is that they wanted something on trains to sell. They sell that 10 tape set(American Steam Series) which I actually sell too, that came from Green Frog Titles. They put a new opening on each video, and deleted all graphics and credits so you think it is theirs.
Since I believe Green Frog has some audio of the narrow gauge, I am guessing that the audio CD was originally done by Green Frog, either one audio tape, or a compilation of their stuff. I didn't know that Madacy had audio of trains, and I am guessing this is the only one.
The DVD's we sell are also Madacy product formerly Green Frog videos. I know a lot of customers who got burned buying them only to find they already had them, under the Green Frog name!
My suggestion is to contact Green Frog Productions and ask them about the stuff. They may be the ones who did them originally and could answer all your questions. Good Luck.
Greg Scholl