Frederikssundbanen is one of six radial S-train lines in Copenhagen; it connects the city center with a number of Northwestern suburbs (notably Herlev and Ballerup) and other townships until Frederikssund on the Western coast of the Nordsjælland peninsula.
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The Frederikssund line opened in 1879 as a single-track railway to Frederikssund from Frederiksberg, which at that time was a station on the main line between Copenhagen and Roskilde.
A third S-train station, serviced by trains on Vestbanen and Frederikssundbanen, is located in Vesterbro, just on the border to Kongens Enghave.