So for my 4th trip Interlaken - Amsterdam I decided to fly. Mostly because this time I am visiting both Amsterdam and Madrid, so have three flights planned, and cannot easily do my usualy Interrail trick...
Result: Interlaken - Amsterdam is a whole 1:20 minutes faster by plane then by train.. And this even though I cut it rather close. I arrived at ZRH half an hour before bag drop would close. But I know the airport. I had printed my luggage tags at home, so once of the train walked to the automated bag drop, where I could immediately get rid of my suitcase. Then I went to the gates, and to my delight there were no queues at security. I was airside less than 15 minutes after getting of the train. A new record.
But yes, It was not materially faster. Shows that even 8-9 hour train rides can be competitive.