A is a service on the S-train network in Copenhagen. It is one of the base services on the network, running every 20 minutes from about 5:00 to 0:30 every day, and every 10 minutes from about 6:15 to 19:00. It runs between Hundige and Hillerød, serving all stations on the inner part of the Køge radial. During daytime on weekdays, every second train continues from Hundige station to Solrød Strand station. On Friday and Saturday nights there is also a 30 minutes service throughout the night.

The Copenhagen S-train, the S-train of Copenhagen, Denmark, is a key part of public transport in the city. It is a hybrid urban-suburban rail serving most of the Copenhagen urban area, and is analogous to the S-Bahn systems of Berlin, Vienna and Hamburg. The trains connect the Copenhagen inner city with Hillerød, Klampenborg, Frederikssund, Farum, Høje-Taastrup and Køge. There are 170 km (110 mi) of double track with 87 S-train stations, of which eight are in neighbouring towns outside greater Copenhagen.