It was a 2 track train. I have a friend who is really into trains, and I described what I had for American Flyer trains. I had
oil drum loaders, lumber loaders, coal loader, little side cars with two guys to pump the handles, two loco's. He said to reproduce the system would be about $2500 today.
I also had an uncle that died about 25 years ago. He had a train system that took up his attic. All of the attic. There was a mountain in one corner with about 6 train tunnels. Must have been an 1/8 mile of track ... it went everywhere.