Here is some advice about organizing a one-day trip from Zürich to Jungfraujoch.

* Check the weather first, and don't go if it is not going to be sunny without clouds. (To get the best view to the valley, you need sunny weather in Interlaken too.) is the recommended website to check the weather at. Most other weather websites give you misleading information, because they claim that they report the weather at Jungfraujoch, but in fact they report the weather of a place a few kms away -- which is completely irrelevant!

* Don't go either if the weather forecast says it's going to be partially sunny. The weather changes quickly, and it might actually become cloudy by the time you arrive, and then you see only uniform whiteness instead of the beautiful snowy mountain scenery.

* Don't worry about the temperature, it's always cold there, about 0 °C in summer. Bring warm clothes (sweater, coat, cap and scarf), and put them on gradually as the train ascends and it becomes cooler.

* Be early. Be on a train at 9:02 (or 10:02 at most). Go through Zürich, Bern, Interlaken Ost, Lauterbrunnen, Wengen, Kleine Scheidegg, Jungfraujoch. There are very good train connections. The train ride takes 4 hours and 20 minutes from Zürich HB to Jungfraujoch. Start at 9:02 in Zürich HB, and return at 16:40 from Jungfraujoch.

* Don't forget your halbtax, it can save you a huge amount of money since the train ticket for the last 40 minutes of the journey is extremely expensive.

* If you have a GA (or Swiss day pass), it's valid up to Wengen. You will have about 10 minutes in Lauterbrunnen to buy the return ticket between Wengen and Jungfraujoch. (If you are really quick and lucky, then you can buy your ticket in Interlaken Ost as well.) Don't buy it the previous day, because the weather may get worse, so you can decide in Lauterbrunnen not to go up to the Jungfraujoch. At Lauterbrunnen there are nice waterfalls, and other hiking and cablecar opportunities.

* When you buy your ticket in Interlaken Ost or Lauterbrunnen, you get a nice brochure with useful tourist information, a map, and a timetable summary for the trains between Jungfraujoch and Interlaken Ost. If you don't get it, ask for it at the ticket counter, because it's very useful.

* If you can, go on weekdays, because the Jungfrau trains are overcrowded on the weekend (to the extent that you can't fit on the train you selected).
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