I've been doing a bit more checking. It seems that the Swiss Pass is good for almost any rail or cable car travel in Switzerland except for travel to the high mountains. For example, I think that you can get to Murren and Gimmelwald on the Swiss Pass but the gondola from there up to the Shilthorn, the Swiss pass gets you a 50% discount - not the full fare. Another example, I think the Swiss pass will get you to Wengen from Lauterbrunnen but from there up to the Jungfraujoch, it gets you a 50% discount. For the Glacier Express, it appears that the section between Brig and Disentis is yet another premium area. It also appears that that is what the 15-30SF reservation fee is for. At Brig, you switch to the cog train. As I said above, we've done the 1/2 fare card and not the Swiss Pass. Let's see if somebody who has done the Glacier Express with a Swiss Pass jumps in.