NS TRAIN SERVICES AND STATIONS
On the line from Amsterdam and Haarlem to Den Haag and Rotterdam. Immediately south of the station, a line diverges east to Alphen a/d Rijn Woerden and Utrecht. The main line through Leiden now has four tracks. North of Leiden, two of those tracks diverge northeast on a flyover to become the "Schiphollijn" (Schiphol Line), serving Schiphol Airport.
Mapping the Station and Lines
Zoomable Google Maps show the station and rail routes in the area.
Leiden Centraal Station
Wikipedia link containing further station information and history.