On my way to Bali I had a stay for about six hours in Amsterdam. I didn’t want to spend then at the airport so I bought a train ticket to the centre. To be honest I still don’t understand the train system. You need to scan your ticket but if you don’t scan it nothing happens. Whatever the ticket cost almost 10 euros for both way. I think this is a bit expensive but if never been in a city and won’t come back in a while you need to take this chance.
