Hi Rockoyster -
<<"Unless my memory fails me I seem to recall that below Rigi Kaltbad the
train ran mainly through a forest so not much to see at all. Unless you
like forests of course.">>
Since I frequently have a car when I go up on the Rigi, I find it convenient to park at Weggis and use the cableway ( eine Luftseilbahn) both ways. That is, in my opinion, the most scenic, though short, ride. In fact, a few years ago, for a couple of seasons, they offered a very scenic gourmet dinner in the cable car, suspended well above Weggis, nearer to Rigi Kaltbad, in the early evening after the regular scheduled runs stopped at about 1900 or 1930, and before the late night last run.a Weggis.
It has been a few years since I used either the train to/from from Vitznau, or Arth Goldau. Thus, it may be my memory that fails me. With that caveat, I recall a fair amount of open fields, as well as views of Bürgenstock and Pilatus out over Lake Lucerne.
I am sure, however, that the ride down to Arth-Goldau matches this description:
Somewhat below Rigi Staffel, where the tracks diverge, and particularly below Rigi-Klösterli the train runs mainly through a forest and in a valley with hillsides that obscure distance views, until you emerge from the forest somewhere above Krabel. At that point, for a short time, you have nice views of the valley and the lakes. ( Zugersee and Lauerzersee.)
So, my memories match those of Cabin Jon. I used to use the route from Arth-Goldau frequently, so that is a fairly reliable memory.
Never hesitant to use the excellent maps available, I looked at these maps:
which shows a fair amount of open views from the Vitznau train, and the passage through forest of the A-G train.
This has more detail, and since it is a topographic map,it shows the hillsides and steep areas:
and, aerial image:
I zoomed in and out a bit, and switched back and forth between the color map and aerial views on both maps. That makes it quite clear where the forests are. The train routes are heavy black and white lines in the color map version once you zoom in far enough. Otherwise, they are thin red lines as you zoom out. Since the hillsides are quite steep in some places, a forest may not obscure the views completely ( you can see over most of the trees in those cases).
I have attached a few images, of general interest. The views of Old #7, now in the Transport Museum, show the valley walls at Rigi Klösterli, where the "train" stopped to take on water.