Lime quarry and lime works rail line in On2 scale

I am starting a new project. Once again in American O scale (1:48) but this time based on a Swedish narrow gauge prototype, namely the old 600 mm gauge rail line at the Bläse lime quarry and lime works. Bläse is located on the Swedish island of Gotland, in the Baltic Sea. The lime stone operation is long since discontinued but the site still exists today, as a museum. The museum includes the restored rail line between the quarry and the lime works, and is run as a tourist line.

Here are some pictures:

My intention is not to model the whole setup or rail line. I am just doing a small part of it as a vignette or diorama. All the same, I would like to make the (future) rolling stock movable and self propelled.

As said, the track is 600 mm gauge, but since that is just 9 mm shy of 2 feet I will be doing the track in On2 scale (2 ft gauge track in 1:48 scale). Hopefully that will make it a little easier to find some ready to run or "kitbashable" rolling stock. And it makes track laying tools such as track gauges readily available.

So far I have cut a piece of foam and covered it with 2 mm cork. This will the be the combined dioarama base and subroad bed. I have also laid out a first version track plan using paper templates. The plan covers the area where the tourist train loads and unloads and where the engine house is located.