Jun 14, 2016 - 7:37 AM
in reply to kickin904
There are two major routes to travel between Interlaken OST to the top at Jungfrauch.
1a. Interlaken to Lauterbrunnen
1b. Lauterbrunnen to Kleine Scheidegg
1c. Kleine Scheidegg to Jungfraujoch
2a. Interlaken to Grindelwald
2b. Grindelwald to Kleine Scheidegg
2c. Kleine Scheidegg to Jungfraujoch
Either route's train journey takes 2 hours, 17 mins -- considering you are just jumping trains without spending time at the stations or nearby areas. Although with a Swiss Travel Pass you can get down at any station, spend sometime and board any incoming trains.
An ideal suggestion would be to start your day early, say, 8am or 9am. Train timetables changes every December so for your trip in April next year, you should check for new train timings after Dec 10, 2016 at www.sbb.ch/en
This is a good site to check about Jungfrau for all activities you can do and all that is open / closed during that time. I went to Swiss this year in the 3rd week of April and pretty much things were open, though could not make it to the Jungfrau but went to Titlis and Pilatus. Few things might be closed due to snow. April is a cross-over between Winter and Spring, ideally Spring season. So things like cogwheels, or activities like zip-lining etc might be closed. Check here : www.jungfrau.ch/en