WestCoast
Established Member
They indeed have them on the Metro but they're also installing them on the mainland station as well (you won't be able to get onto the concourse without a ticket). When we were there they were installed but not in use. As they're moving to the OV-Chipkaart now and I guess they're there stop people riding the train for free to the airport etc. All the other stations on the NS network just had card readers.
That will be a pain at Amsterdam Centraal, as many appear to cut through the station to reach the free ferries at the back.