The Belle Epoque coach only runs on the MOB line Montreux – Zweisimmen.
This route elicits common queries on this forum so I have got a standard text:
Current tourist branding can be confusing
The Luzern – Interlaken railway is actually the Brunig Pass (the true Goldenpass is just the MOB railway Zweisimmen – Montreux).
A few facts about the Montreux – Zweisimmen railway – ie the MOB (Montreux-Oberland Bernois):
The Golden Pass is historically only Montreux – Zweisimmen, only more recent marketing branding takes the ‘Goldenpass route’ east of Zweisimmen to Interlaken and beyond to Luzern.
The Luzern – Meiringen – Interlaken line is the Brünig pass line operated by Zentralbahn (ZB), which dubs the regular trains “Luzern – Interlaken Express’. Just take one of these trains and get off at Meiringen.
The Golden Pass is the touristic branding for the Montreux – Oberland Bernois (MOB) railway which runs from Montreux to Zweisimmen, but after a few years of favouring ‘Goldenpass services’, the company decided it was losing its tradition and has reverted to putting the Chemin de Fer Montreux – Oberland Bernois name on publicity and train coaches.
The ‘Belle Epoque’ coaches are old pullman style cars from around the 1930 but only a couple are original the rest are replicas
MOB pioneered the Panoramic coach concept on Swiss trains, starting in 1976.
It hardly matters anyway as most modern Swiss trains have large windows, even if not officially panoramic. The key element of a ‘panoramic’ coach is ‘toplight’ windows above your head but in practice very few of the major views from panoramic trains are directly above your head, so the view through the normal side part of windows is normally fine.
I recommend using regional trains on the MOB (the real name for the Montreux – Zweisimmen railway). Again, this gives you the flexibility to get on a train at whichever time suits you.
If you do do the MOB railway you can catch any train, there is no need to book, and in fact you could pick it up anywhere along the line if you fancy.
Here is the timetable PDF for the MOB: http://www.fahrplanfelder.ch/ fileadmin/fap_pdf_fiel ds/2018/120.pdf
It is very scenic, but the MOB route is far from being the most spectacular (although any dubbing of this nature is going to subjective and personal) in Switzerland.