Hi Travellyn -
I'll make a start on answers, but will have to break for dinner in few minutes. Then, more later. I'll plan to include a screen grab from the timetables.
For better understanding, you should look at a map in conjunction with the timetables. The following map, when zoomed in, and with Traffic/railway(only) checked on the menus for "points of Interest" will give you a clear picture of the railways station locations. If you click on the icon for the railway station, you will get an abbreviated timetable for arrivals and departures at the station.
This link shows Interlaken Ost, which is one of two stations in Interlaken, and the only one you need to pay attention to.
IWest is at the lower right on tne linked map. You will pass through it.
Interlaken Ost (IO) is where you will transfer to the train for Lauterbrunnen.
<<"On 25th April 16 departing approx. 9am-10.30am ish . 1) I'm interested in the Golden Pass Line with Panoramic carriages if possible.. Can you please tell me if this is avail on this day around this time frame or close to just after the time, and if so, what time does it depart">>
There are trains at xx05 taking 1 hr 50 minutes to IO.
If I expand an entry in the timetable, I see that the Luzern-Interlaken Express makes the journey via Meiringen, which is what you seek. It seems that the trains on that leg are no longer called Golden Pass trains.
I have not figured out panoramic windows at this moment, but the trip is scenic even in regular cars. Sit on the right..
There is only one station in Luzern to worry about. Luzern HB or "main station." Inthe timetable it is Luzern or Lucern or Lucerne.
Here is a station map, which you will not need.
www.sbb.ch/content/dam /infrastruktur/trafima ge/bahnhofplaene/plan-luzern-a4.pdf#?lang=en