Sep 30, 2017 - 9:59 PM
in reply to CopperPot
In addition to the links Lucas provided, you may find this helpful:
Zoom in, and you'll see the train lines. It helps to see how the different routes run.
<<"Also, it seems SBB doesn't recognize the Swiss Rail Pass and only offers a discount for the Half-Fare card? Is the Rail Pass not valid on SBB trains?">>
On most lines, travel is "free", that is, there is no extra charge beyond the cost of the Swiss Travel Pass. There is no "Swiss Rail Pass."
This page gives you links to information on all of the travel passes.
The general rule for the Swiss Travel Pass is that travel between population centers.....cities, towns, etc. ... has no added cost beyond the cost of the pass itself. Thus, the trip from Lauterbrunnen to Wengen or to Mürren via Grütschalp is covered. However "excursion trains" and scenic railways, many of which are privately owned, such as the railroad from Wengen up to the Jungfrau, only give a partial discount for a travel pass.
Details of validity for the various travel passes are shown on maps in the individual links on the page that I linked above.