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. The main northbound platform is between Track 4 and Track 5, and the main southbound platform is between Track 8 and Track 9. Between Track 5 and Track 8 are two main express tracks for trains not stopping. South of the station, a platform serves Track 1 and Track 2, stub tracks for the terminating trains between Leiden and Utrecht.
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.
4b Den Haag-Leiden-Haarlem-Amsterdam
5b Den Haag-Leiden-Schiphol-Amsterdam
8b Amsterdam-Schiphol-Leiden-Den Haag
9b Amsterdam-Haarlem-Leiden-Den Haag
Leiden Centraal Station
Wikipedia link containing further station information and history.