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Klampenborgbanen is the shortest (13.3 km from København H) of six radial S-train lines in Copenhagen. It runs parallel to the Kystbanen regional line from central Copenhagen until Klampenborg, and serves residential neighbourhoods in eastern Gentofte as well as popular recreational destinations at Klampenborg such as Dyrehavsbakken and Jægersborg Dyrehave.
|København H||C||30 November 1911||15 May 1934||Central station; also all other radials; bus terminal; cross-link express bus 250S|
|Vesterport||C||15 May 1934||Also all other radials|
|Nørreport||C||1 July 1918||15 May 1934||Also all other radials; transfer to metro; bus terminal; cross-link express buses 150S and 350S|
|Østerport||C||2 August 1897||15 May 1934||Also all other radials; named Østerbro until 1934|
|Nordhavn||C||15 May 1934||Also Farum and Hillerød radials|
|Svanemøllen||C||15 May 1934||Also Farum and Hillerød radials|
|Hellerup||C||22 July 1863||4 March 1934||Also Hillerød radial; transfer to ring line; bus terminal|
|Charlottenlund||C||22 July 1863||4 March 1934|
|Ordrup||C||1 July 1924||4 March 1934|
|Klampenborg||C||22 July 1863||4 March 1934|
The Klampenborg radial is served by trains on service C, which stop at all stations.
Before 1979 the main service to Klampenborg was service A. Historically, service on the Klampenborg radial has often been reinforced in busy periods by ring line trains continuing northwards from Hellerup. This practice has been abandoned (so far) with the 2007 timetable; instead the frequency of the main C service is doubled most of the day.
Klampenborgbanen opened in 1863 as a branch line from Nordbanen. The branch was completed several months ahead of the main line, because the private railway company wanted to profit as much as possible from the summer season of 1863. The line was primarily a "picnic railway"; its terminus at Klampenborg was close to the attractions such as Dyrehavsbakken amusement park, the Jægersborg Dyrehave forest and the Bellevue beach. The expectations were met: the railway was an immense success from day one.
The original route south of Hellerup was different from the current one; see Nordbanen for details. In 1897 Klampenborgbanen between Hellerup and Klampenborg became part of Kystbanen from Copenhagen to Helsingør. Over the years it became difficult to run both the local trains to Klampenborg and the Helsingør trains on the same two tracks, and a dedicated local double track from Hellerup to Klampenborg was built in 1928.
Because of the large outing traffic (as late as 1950 Sundays were far busier than weekdays on the Klampenborg branch) Klampenborgbanen was a natural first choice when the decision to electrify the local rail traffic around Copenhagen was taken, and the first S-trains ran in 1934. Since then little has changed. As much of the population has moved out from the city center the Sunday traffic has become less important, but at the same time the line has gained a modest commuter patronage on weekdays.