S-train (Copenhagen) in the context of Hillerød

The Réseau Express Régional (French pronunciation: [ʁezo ɛkspʁɛs ʁeʒjɔnal]; English: Regional Express Network), commonly abbreviated RER (pronounced [ɛʁəɛʁ]), is a hybrid commuter rail and rapid transit system serving the city centre of Paris and its suburbs. It acts as a combined city centre underground rail system and suburbs-to-city-centre commuter rail, similar to the S-Bahn in Germany, Austria and Switzerland, S-train in Copenhagen, the Pendeltåg in Sweden, the Overground and Elizabeth Line in London, S Lines in Milan, plus many other commuter rail networks around the world.

Conceived of as a métropolitain express ('express metro') during the mid-1930s, the scheme was revived in the 1950s and construction began in the early 1960s. The RER was not fully conceptualised until the completion of the Schéma directeur d'aménagement et d'urbanisme (rough translation: 'master plan for urban development') in 1965. The RER network, which initially comprised two lines, was formally inaugurated on 8 December 1977 in a ceremony that was attended by President Valéry Giscard d'Estaing. A second phase of construction commenced at the end of the 1970s which saw additional lines constructed along with extensions to the original two. The RER is operated partly by RATP, the authority that operates most of the public transport in Paris, and partly by the SNCF, France's national rail operator.

The Copenhagen Metro (Danish: Københavns Metro [kʰøpm̩ˈhɑwˀns ˈme̝ːtsʰʁo]) is a light rapid transit system in Copenhagen, Denmark, serving the municipalities of Copenhagen, Frederiksberg, and Tårnby.

First opened in October 2002, the driverless light metro supplements the larger S-train rapid transit system, and is integrated with local DSB and regional (Øresundståg) trains and municipal Movia buses. The metro operates 4 lines and operates 44 stations, 30 of which are underground. The M1 and M2 lines serve western and eastern Amager (including Copenhagen Airport) respectively, sharing a common line between the city centre and Vanløse. The M3 is a wholly underground circular line connecting Copenhagen Central Station with Vesterbro, Frederiksberg, Nørrebro, Østerbro and Indre By. The most recent line, M4, supplements the M3 line and connects it to Nordhavn and Sydhavn, as well as Valby via Copenhagen South. The fifth line, M5, is currently in the planning stages and will serve Refshaleøen as well as the under-construction Lynetteholmen neighbourhood, with an expected opening date in 2035.

Holte station is a railway station serving the suburb of Holte north of Copenhagen, Denmark. It is served by S-trains on the Hillerød radial of Copenhagen's S-train network. The station is also served by nine bus routes, providing connections to all nearby towns and villages.