But don't reserve a ticket to Jungfrau ahead of time. You want to go only if it's clear at the top. Too much money to see clouds only. I remember lots of TVs around, broadcasting live views from the top.

Going June 6,7. Do you think if take the early trip they could be clouds?

You can never predict this early if there will be clouds or rain or fog or mist at the top - there are weather reports in hotels on TV and in tourist offices, etc and of course on smart phones - heed Mimar's warnings - there should be no problem booking that train - I've ridden it several times by just showing up, even in August - seemto be able to handle whoever shows up - are reserved seats even possible?

Thank you for all advise. I will wait when I am there.