Not worth it for 4-day visit to Amsterdam?

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Basically, you will find free (!) Wifi in certain Intercities (the quick trains between different cities) only. These trains are not specified on beforehand, but you can recognize these trains from the Wifi-logo on the outside of the train. You have to connect with the "Wifi in de trein"-network.

From: http://travel.stackexchange.com/ques...ands-have-wifi