Apr 21, 2018 - 12:01 AM
Interlaken Ost is the junction station between three railways:
the main line SBB railway to Bern via Spiez
The Brunig line to Luzern via Brienz
The BOB (Berner Oberland Bahn) line to Lauterbrunnen and Grindelwald
As such if you arrive at Interlaken Ost on any of these and want to depart on one of the other lines you have to change trains.
There is also a boat landing stage from where the boats sail to Brienz and Giessbach