We have a family here in my community that puts together a little event every year in which we're invited. They have a miniature train complete with tracks, mini buildings, and everything that runs around the perimeter of their 5 acres of property. Actually, they have two trains running at the same time. The track is, I think, 12-inch spacing on the aluminum rails and the engines are either electric or gas powered. (I think they have both). We all come over in October when they decorate their yard for halloween, and ride the spooky train through the forest, over the trestle, through the tunnel, and past the graveyard. It's directly adjacent to the CN railway line so the CN operators really like to toot their horns and wave at us when they speed by with their freight. Tycho made his appearance this afternoon, and this little girl eventually warmed up & began following me about, tugging on my leg & wanting attention. She just learned to walk, I think, and even dropped her chocolatey treat in order to grab hold of my nose with her candy covered hands & mouth. Err, I don' mind.... though Tycho needs a bit of a wash tonight

You've educated the rest of us a little on geology, my turn to educate you a little on trains.
From what I can tell from your pictures and the size of the railroad cars relative to the people, it looks like 7 1/2" or 7 1/4" gauge track, which would put the railroad at a scale of 1 1/2" per foot, which is a common scale for ride on trains. The reason for the two gauges, guys in the north-east like 7 1/4" gauge, which is more accurate to scale of portotype gauge, the guys everywhere else like 7 1/2" gauge because it's more stable for ride on.
Chocolate... Hoo boy.