Here is a bit more detail-
First- Trafimage Maps. Useful but complex. On the page in the SBB website where you saw this information -
<<"I also saw this link to view the stations on the SBB site.
Station plans provide information on boarding, alighting and changing trains. They show available services, shops and combined mobility in and around the station.
Trafimage station plans | SBB
These plans are now available for more than 60 stations. To see all stations that have a plan, please zoom into the “overview of station plans” map...">>
Look for the "See More->" link in a red box on the right.
Click on it. You get a map with a bunch of station icons on it. It deals with the main stations, and, so far, not the smaller ones. Spiez and Interlaken Ost are not available. For the ones that are available, click on the icons. Zürich and Bern are there, which is good because they are heavily used and Zürich is a very complex station. Trafimage maps show stores, service offices, etc.. I use that as a last resort. I need it to find specific travel support offices in Zürich main station.
See Screen grab #4, attached.
Now for your specific problem.
For your journey, I have opened the SBB timetable.
I forgot which way you were going, so I chose to go from Spiez to Zermatt. You can make the reverse choice when you try this. Check screen grab #1.
I have entered Spiez as a start point and Zermatt as a destination. If I choose NOT to put anything in the "via " box ( click on "via" ) then I will get routed on the fastest route. That goes through Visp, and from Visp it then takes the new "Lötschberg BASIS tunnel" to near Spiez. That new lower tunnel shortens the old traditional higher "Lötschberg Pass route" by about an hour. If you are in a hurry, use that fast route.
Te scenery inside the tunnel lacks interest for me.
If you prefer the scenic route, force the timetable to route you through some station on that route. Kandersteg is the usual choice on this route
On that first page, ther eis a choice for "advanced timetable." That allows you to enter "vias" for a series of stations. You could use it for your set of multiple stations. I usually just put in a start and finish and one "via" but and break the journey up into shorter segments. I find it simpler. However, you can force it through several vias if you wish..
This map can help you visualize the geography. I set it for Kandersteg and I have zoomed it in to zoom level 32, which makes the rail tracks stand out. I have used the menu under "Points of Interest/ Traffic" to turn on icons only for rail stations:
Slide the map up the screen and you can see Brig and Visp.. ycan also see Goppenstein, where the old upper short tunnel ends as described below. Zoom the map out and you can see the overall lay of the land for Zermatt, Interlaken, etc.
For your interest, I chose to put "Kandersteg" in the "via" box for screen grabs numbered 1, 2, and 3 , attached
That takes you high up through scenic valleys on both sides of Kandersteg. There is a short ( old) tunnel from Kandersteg to Goppenstein as part of the route.
Enter your start and finish and put Kandersteg in the via box (it says "add via +"). You get the via box by clicking there. (if you want more "vias" use the "advanced timetable."
Enter date and time.
"Search for connection."
You get screen grab #1. with several journeys at different times, The dots on the lines signify change of trains. Read the header of the page carefully.
Next, chose one journey. Click on it.
You get screen grab #2. It shows platform numbers.
There is now a "+" sign in a circle on the vertical line for the route. Click on it. It shows all intermediate station stops. Th e + becomes a "-".
Click on the minus to hide the intermediate station stops. You don't need track numbers or platform numbers because you are not changing at those intermediate stations.
At first, it certainly does seem overwhelming. And, to make it worse,the timetable has been dumbed down for smartphones with small screens. That process of revising the software is still underway. So, now and then, there are glitches, or those of us with old habits have trouble figuring out the software. ;-(
However, after you follow those steps a few times, it becomes intuitive.
And, once you know the platform numbers, you can find the track numbers on Google maps as Rockoyster described.. ...often two tracks on the two sides of one platform, as at Spiez, where tracks 2 and 3 are on one platform. Just walk across the platform for that 3 minute change..
Trafimage maps will give you that, too, if there is one for your station.
I have described the screens that I get on my desktop computer. I have the smartphone app, but don't use it unless forced to, so I don't know how that process would work out on small screens. The logic would hold true, however.
Let us know if you still need some more help. I think I answered
<<"I see the platorms on the timetable but where do I see the track information on the train schedule?..">>
but I may not have.