NS TRAIN SERVICES AND STATIONS
Although Amsterdam is the official capital of the Netherlands, Den Haag or the Hague is where the government is actually located. Den Haag is also the capital of Zuid Holland province. For many years, Den Haag was the only major city in the Netherlands with multiple main stations. The "Den Haag HS" station was a through station on the old "Holland Spoor" (Holland Rail) line from Amsterdam Haarlem and Leiden to Rotterdam. While the "Den Haag SS" station was a stub station on the "Staatsspoor" (State Rail) line east to Gouda and Utrecht. In 1973, the SS station was replaced with a new larger stub station, Centraal Station (Den Haag CS), in the same area. And new connecting tracks were added between Den Haag CS and the HS main line, for new terminating trains. Trains between Den Haag CS and Rotterdam and points south also stop at Den Haag HS. Until 2006, Nederlandse Spoorwegen operated a line between Den Haag and Rotterdam Hofplein station, via Pijnacker. That line terminated at Den Haag HS, later at Den Haag CS. In 1977, the "Zoetermeer Stadslijn" (City Line) began operating from Den Haag CS east to the newly developed suburb of Zoetermeer. That line would diverge from the Rotterdam Hofplein line at Leidschenveen. In 2006, operation of those two lines were transferred to the local transit companies, which would operate them as light rail lines known as "Randstad Rail". Randstad literally means "edge city", and refers to the four largest cities in the Netherlands (Amsterdam, Den Haag, Rotterdam, Utrecht) and the region encircled by them. The Rotterdam Hofplein line was transferred to RET (Rotterdamse Elektrische Tram), which historically has operated electric trams in Rotterdam. Those trains continue to terminate at Den Haag CS. The Zoetermeer Stadslijn was transferred to HTM (Haagsche Tramweg Maatschappij), which translates into "Hague Tramway Company". A new track connection was constructed north of Den Haag CS, enabling direct light rail service between the established tram or streetcar system in Den Haag, and Zoetermeer.
Mapping the Station and Lines
Zoomable Google Maps show the station and rail routes in the area.
Den Haag Centraal Station
Den Haag HS Station
Wikipedia links containing further station information and history.