I've travelled extensively on the NS network, however I've never had the need to do this: I need to buy a ticket for Schipol to Heerlen. The price is 22,90 euros for a single. The route on the journey planner is given as one change at Utrecht. Now, I know you can break your journey on NS tickets. I'd like to travel via Amsterdam Centraal and stop there for a few hours, if I put this station in the 'via box' the price increases to around 26 euros. My question is do you need to enter the via point in this case, or can you buy the cheaper fare and travel via Amsterdam Centraal?