Here is a start:
Use the timetable linked below.
read the instructions on the first page.
In the timetable, you can see the journey in stages....Luzern-Interlaken, Interlaken Montreux, or using the advanced features, construct the entire journey.
You can pick any departure time that you want.
You can travel the route in Golden Pass trains with special cars on some sections, or use "regular" trains on the same route, and still see the same scenery.
For example, leave Luzern at 0905, arive Montreux at 1413.
See attached screen grab from the timetable, with one of four journeys expanded by clicking on the "+" sign to the left of the journey
Breaking it into pieces makes more sense if you want to stop at Interlaken. However, that is not a very scenic town in its own right, so you might want to skip that. You won't have time to go into the valley toward the Jungfrau.
Note that the timetable defaults to the fastest route. So, from Luzern to Interlaken, you might wish to put "Meiringen" in the "via" or "connections" box. That leg is called the Luzern-Interlaken Express. You may get it anyway, without the "via"
From Interlaken to Montreux, be sure to put Zweisimmen in the "via" or "connections" box. Otherwise, you'll get routed through Bern.
Note that sunset time in Montreux is at 1648 on November 30.
www.timeanddate.com/su n/switzerland/montreux ?month=11&year=2016
You may wish to save time on the return by going to Bern from Montreux, with a change at Lausanne, then to Luzern. Depart Montreux for Lausanne at 1623 or 1723 or 1823 for a journey to Luzern via bern taking 2 hrs, 37 minutes.
A clerk at the rail station can also print out an itinerary for you.
Please let us know if you cannot make the time table work for you. The first page of the link I gave has some instructions, but there is a lot of detail buried inside.