Amsterdam Sloterdijk is a major railway junction to the west of Amsterdam Centraal station. It is at a rail-rail crossing, with an additional chord. It is on the railway line from Amsterdam Centraal to Haarlem and the last station before the junction where the line Amsterdam Centraal-Zaandam diverges from it and on the crossing west branch of the Amsterdam-Schiphol railway line between Schiphol and Amsterdam Centraal.
The Hemboog chord connects the crossing lines, providing a direct connection between Schiphol and Zaandam. There are platforms at both crossing lines and at the Hemboog; for the latter there is a separate entrance on another side of the station square.
Wikipedia https://en.wikipedia.org/wiki/Amsterdam_Sloterdijk_station
Address 103B Orlyplein, Amsterdam 1043DT, Netherlands
Coordinates 52°23'20.514" N 4°50'17.182" E