New Route Suggestion - Interlaken To Jungfraujoch

Multigauge, multi route and epic scenery and not too long.

 

I'd skip to Jungfraujoch, from Kleine Scheindegg to Jungfraujoch is mostly in Tunnel. The BOB and WAB network would be good though. Or maybe the Zentralbahn towards Luzern?

 

Please add more information and detail about this route

 

BOB Line https://en.wikipedia.org/wiki/Bernese_Oberland_Railway connects to Wengeralpbahn https://en.wikipedia.org/wiki/Wengernalp_Railway in the Swiss Alps, mostly rack rails but with some flat running. Standard gauge at interlaken and a narror gauge to brienz.