Hi Mcwl13 -
I was a regular guest at the Camps- Stalders' Bergsonne beginning sometime before 2003.
At least twice a year most years, sometimes for a several day stay. It is hard to beat the views from their terrace. Dorly was a creative chef and and her warm personality added to the pleasure of a stay there.
Last train up from Rigi Staffelhöhe on October 17th is at 1937. I picked a date at random, since you did not give an exact date, as requested in the forum rules. I'll caution you that many mountain and lake transport schedules are reduced in Autumn and Winter, with changes common in October. Make sure to use the timetable to check your specific dates.
That is one reason why we ask for exact dates.
I do not know what time the kitchen opens at the Edelweiss. But, if is at 1800, you will have trouble catching a 1937 train.
By the way, from Wiki -
Harderkulm, a viewpoint on the Harder near Interlaken in canton of Bern
Kulm (district), canton of Aargau
Kulm, the highest point of the Simplon Pass, canton of Valais
Oberkulm and Unterkulm, two related villages in the canton of Aargau
Pilatus Kulm, the name of the top cable car station on the Pilatus near Luzern
Rigi Kulm, the highest peak of the Rigi massif in canton of Schwyz, near Luzern
Part of the name of many mountain restaurants on the top of a mountain">>
"der Kulm" may be related to the English word culmination, I suspect, and is commonly used in Switzerland, Germany, Austria for the highest point of a mountain. Another word is der Gipfel, as in Männlichen Gipfel, in the Berner Oberland. Only in Czech, as far as I know, does one put the "l" before the "u" in the related word.
I have no way to judge the capabilities (or lack of them) for various on-line reviewers of restaurants, especially since the issues involved are very subjective. I can say that food in Switzerland is commonly a good deal more expensive then in the USA. And, prices can be higher in places which have special tourist attractions.Such as Rigi Kulm.
The restaurant at the Hotel Edelweiss at Rigi Staffelhöhe recently got its first Michelin star. That is a likely reason to elevate prices, and the meals are definitely not cheap.
By the way, the last time I ate there, I met Dorly Camps. For what it is worth, she was eating there, and I chatted a bit with her. She's not changed very much; as charming as ever.