Private train cars are the most interesting part. I wonder how signaling works? Does each house/"station" have its own fork in the tracks for getting their private train car home?
There is no signalling, except for one marker in the middle of the longest stretch of single track rail between turnouts. Whoever reaches it first can continue, the other party has to go back. Though apparently, you can see whether the other car will be first, and wait.
Also, you don't really need forks, because are light enough to be lifted off the tracks. Some pull them up on special car trailers.
Looking at the map, it seems there are only two endpoints to the line on the island.
On the other hand, https://en.m.wikipedia.org/wiki/Nordstrandischmoor claims there are only 4 households on the island, so even assuming each has its separate fork, “each house” isn’t that much.
I wonder what system they have to prevent the two locomotives from meeting each other half-way through and to get one of the locomotives to a home when needed.