Small train station, which would be your stop for going to the Zaanse Schans.
From Amsterdam Central Station, getting to Koog-Zaandijk is just about a quarter of an hour (direct connection). Trains go (roughly) from 6am till midnight, every day of the year, several times per hour.
From station Zaandijk Zaanse Schans to the entrance of the Zaanse Schans is about a 15 minutes walk.
(Walking route to Zaanse Schans (on OpenStreetMap)).
Note: this station used to be called Koog-Zaandijk. This was changed in December 2016, in order to make it clearer that this is the station you need if you want to go to the Zaanse Schans.
Train compartment in Dutch double decker train