Originally at the split of the line from Amsterdam to Harlem and beyond to Rotterdam, and the line from Den Helder and Zaandam to Amsterdam. All tracks and platforms were on an east west orientation. In 1986, service was introduced between Amsterdam CS (Centraal Station) and Schiphol Airport. Selecting a route for this line was a challenge. Amsterdam is a historic old city, close to sea level which makes extensive tunneling difficult. The most practical location for the new line to Schiphol would be at the west edge of Amsterdam, extending south from Sloterdijk station. At Singelgracht Aansluiting (Interlocking), 2 km east of the station, the new line would diverge north, ascend and loop south. And pass over the existing tracks on a north south orientation. In addition a connecting line was built, diverging from the line from Den Helder and Zaandam at Houtrakpolder Aansluiting (Interlocking), 1 km west of the station. And connecting with the line to Schiphol immediately south of the station. Track 3 and Track 4 and Track 5 and Track 6 are on line from Den Helder and Zaandam to Amsterdam. Track 7 and Track 8 are on the line from Amsterdam to Harlem and beyond to Rotterdam. Track 9 and Track 10 are on the connecting line between Zaandam and Schiphol. And Track 11 and Track 12 are on the new line between Amsterdam and Schiphol. Track 1 and Track 2 are Amsterdam Metro tracks, running north and south and paralleling Track 11 and Track 12 to the east.

Mapping the Station and Lines
Zoomable Google Maps show station tracks, track numbers, and rail routes radiating away.

Typical Rail Services/Normal Track Assignments
Track numbers where the regular NS services normally depart the station.

 3  Amsterdam-Zaandam
 4  Amsterdam-Zaandam
 5  Zaandam-Amsterdam
 6  Zaandam-Amsterdam
 7  Amsterdam-Haarlem
 8  Haarlem-Amsterdam
 9  Schiphol-Zaandam
10  Zaandam-Schiphol
11  Amsterdam-Schiphol
12  Schiphol-Amsterdam


Amsterdam Sloterdijk Station
Wikipedia link containing further station information and history.