It’s only a short section that you’ll miss. I’m afraid I can’t remember how picturesque that section was! I seem to remember the section west of Interlaken was the most beautiful.

On the plus side, the Swiss rail-bus connections will be flawless, so you don’t need to worry there. But on the negative side, it’s a long journey with three connections, vs direct on the Intercity.

You won’t need a reservation for the bus, and you don’t need a reservation for the train in the regular cars, only the panoramic car.

The west of Interlaken, is it before Meiringen?

Regular cars here does it mean IC trains? 

Also, if i do reserve, so i must reserve separately? First reserve Interlaken Ost - Meiringen, then make another reservation for Giswil - Luzern?

West of Interlaken - sorry, I meant the section of the line between Interlaken and Montreux, not the part you’re taking. I could be misremembering though! The whole line is very scenic all the way through.

Regular cars - no, I mean this same train carries both Panorama cars with bigger windows and regular cars. You can travel in the regular cars without a reservation. The scenery’s the same!

If you do decide to reserve, I’m pretty sure the reservation would include both sections of train as long as you reserve Interlaken-Luzern.

I'm not even sure you can book this train. I wouldn't bother anyway. All trains have big windows ("panorama carriages").

Every bit of that journey is scenic even under the fog (expected in November). I would definitely take that route even with a rail replacement bus, it's a very straightforward change.

If you've got time take the boat on Lake Brienz or Lake Thun (included in Eurail).

I'm not even sure you can book this train. I wouldn't bother anyway. All trains have big windows ("panorama carriages").

Every bit of that journey is scenic even under the fog (expected in November). I would definitely take that route even with a rail replacement bus, it's a very straightforward change.

If you've got time take the boat on Lake Brienz or Lake Thun (included in Eurail).

Ok we will definitely take this panoramic train.

Unfortunately, according to their website, the boat on these 2 lake will not be operating on 16 Nov, is that correct?

Eurail website is showing we could reserve. But price is unavailable for Interlaken Ost - Meiringen.

And somehow price is available for Giswil - Luzern. Anybody please advise whether there is another website to reserve the panoramic express. We prefer to reserve as we travel as family.

The Swiss railway website shows that you can’t reserve that train, even if I enter the legs separately. And I guess that means nobody else can.

https://www.sbb.ch/en/travelcards-and-tickets/tickets-for-switzerland/seat-reservations.html

I’m not sure where Eurail is getting their availability, but you’ll have to get the reservations posted to you, and it sounds like an expensive and clumsy process.

I really wouldn’t worry about finding available seats - especially in November.  You can also ask at the station once you’re in Switzerland, but I wouldn’t bother.