On the line from Breda to Rotterdam. Immediately south of the station, a line proceeds east to Gorinchem and Geldermalsen. At Lage Zwaluwe, 15 km south of Dordrecht, a line diverges southwest to Roosendaal and into Belgium. The main northbound platform is between Track 2 and Track 3, and the main southbound platform is between Track 4 and Track 5. Track 1 next to the station building is also used by northbound trains. Track 15 is a stub track south of the station building, and is used by trains to and from Gorinchem and Geldermalsen.

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.

1   noord/north Intercity
2   zuid/south
3   noord/north Intercity
4a  noord/north Sprinter
4b  zuid/south Sprinter
5   zuid/south Intercity
15  Dordrecht-Gorinchem-Geldermalsen


Dordrecht Station
Wikipedia link containing further station information and history.