Train from Jungfraujoch to Lauterbrunnen

Hi all,

I am going up to Jungfraujoch from Grindelwald (Grindelwald -> Kleine Scheidegg -> Jungfraujoch).

But for the return trip, I want to choose a different route : Jungfraujoch -> Kleine Scheidegg -> Lauterbrunnen.

It seems to me that there is a 4-minute break at Wengen station, before the train continues to Wengwald and finally to Lauterbrunnen.

My question: do I need to change to another train at Wengen, or I just stay in the same train (the train stops for 4 minutes and then move on to Wengwald and finally to Lauterbrunnen?

I have seen others mentioned that they used the Swiss Travel Pass to purchase the 25% discount ticket from Jungfraujoch -> Kleine Scheidegg -> Wengen (not to Lauterbrunnen) because from Wengen onwards, it is totally free of charge with the use of the Swiss Travel Pass. But SBB seems to tell me that I do not have to change train, the same train will continue to Lauterbrunnen.

In short, if I am using my Swiss Travel Pass for the Wengen to Lauterbrunnen trip, do I need to change train at Wengen?

Thanks all in advance,

daifei888