Tram network in the Netherlands
The Hague semi-metro is a light rail system in the form of a semi-metro in The Hague, the Netherlands. It is used by Lines 2, 3, 4, 6 and 34 of the local tram network. Three linked sections were constructed for the core of this network: the viaduct with the tram stations "Centraal Station" (CS) and "Ternoot", the tram tunnel and the viaduct through the "Beatrixkwartier" office area. 
The semi-metro started in 1976 with the viaduct over CS and "Ternoot". On semi-metro routes, tram vehicles run in tunnels and/or on viaducts in the city centre and otherwise largely on free tracks. It consists of five stations, and is operated by . As long as the conversion of the tram network to metro standards has not been completed, it is called semi-metro.
The Hague Semi-metro is mainly inspired by the Brussels Premetro, as well as other systems. During the planning and partially construction the Brussels system was referred to as "semi-metro". The German concept Stadtbahn (in Cologne for example) is comparable to the situation in The Hague: with tunnels and viaducts. Friedrich Lehner (who also set up the Hanover Stadtbahn) introcuced the concept in The Hague in 1964. Plans were formalised in 1969 in the plan called "Nota Openbaar Vervoer 1969". 
Network.
The viaduct with the stations "Centraal Station" (CS) and "Ternoot" was opened in 1976. A for trams was opened in March 2004. The tunnel incorporates two underground stations: "Spui" and "Grote Markt". The branch line towards Zoetermeer opened on 29 October 2006 for RandstadRail line 4, and on 20 October 2007 for RandstadRail line 3 and includes the "Beatrixkwartier" station.
The elevated viaduct includes a branch line for RandstadRail trams that connects to the former Hofpleinlijn near Den Haag Laan van NOI railway station. Trams on RandstadRail lines 3, 4 and 34 use this connecting line. East of Laan van NOI they share tracks and stations with Rotterdam Metro line E trains as far as Leidschendam-Voorburg before diverting onto the former Zoetermeer Stadslijn towards Zoetermeer.
Additionally a tunnel with one underground station was opened in 2010 solely for Line 19. It wasn't mentioned in the 1964 plan nor in the final 1969 plan.
Safety.
From the opening of the first section in 1976, the tracks were equipped with signalling and motorised switches. Control was provided by the Central Traffic Control (CVL) via an intercom. This system was renewed in 2004, additional to the signalling system, a system on the trams was installed that can intervene independently. This system or ARI (Automatic Brake Installation), will stop a tram when it is travelling faster than the speed indicated by the signals.
Fleet.
As of 2024, the fleet consists of approximately 200 trams of three types:
References.
 ;templatestyles src="Reflist/styles.css" / ;
External links.
 Media related to at Wikimedia Commons