Today I started my journey in Chur, taking the train across the Oberalp pass, to Andermatt, through the Furka, and then traveling through Valais until Visp. On the way back I took the route through the old Lötschberg tunnel.
It’s a very lovely route. You start with the Rhine Gorge while still in Grisons. Then, after changing trains and train operator in Disentis/Mustér, you climb to the top of the Oberalp pass. Shortly after you arrive in Andermatt, after getting rid of some of the gained elevation.

From Andermatt the Furka tunnel follows, which is quite long with 15.4 km (of course still quite short compared to the GBT with 57 km). Afterwards the route slowly makes its way through Valais. The whole journey from Andermatt to Visp took a bit more than two hours.
My train from Andermatt still had carriages where you could open the windows, which was quite nice to get some fresh air and take pictures without the annoying reflections.

Finally, one in Visp, I took the train through the old Lötschbergtunnel. The route from Brig to the tunnel, slowly gaining altitude while having a nice view across the valley, is lovely. The tunnel itself was again on the longer side with 14.6 km (the Lötschberg base tunnel is 34.6 km).

Overall, it was a very nice journey and the weather was perfect.
