| A | |
| Logo Alt: | A |
| Type: | Suburban rail, urban rail |
| System: | S-train |
| Status: | Operational |
| Locale: | Metropolitan Copenhagen |
| Start: | Solrød Strand |
| End: | Hillerød |
| Stations: | 35 |
| Owner: | Banedanmark |
| Operator: | DSB |
| Stock: | Litra SA and SE |
| Linelength Km: | 57 |
| Tracks: | 2 |
| Electrification: | 1650 V DC overhead lines |
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,[1] 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.[2]
Since the first part of the Køge radial opened in 1972, letter A has been used for the principal service on its inner part. Before that time the most constant characteristic of service A was that it ran on the Klampenborg radial in the northern end of the system.
| Name | Southern end | Years | Northern end |
|---|---|---|---|
| 1a | all stops to Valby | 1934–1940 | Klampenborgbanen
|
| terminated at København H | 1940–1950 | ||
| A | Frederikssundbanen
| 1950–1952 | |
| as above, extended to Herlev in rush hours | 1952–1972 | ||
| Køgebugtbanen
| 1972–1976 | ||
| all stops to Hundige | 1976–1979 | ||
| all stops to Hundige; extended to Solrød Strand evenings and weekends | 1979–1983 | Nordbanen
| |
| all stops to Hundige | 1983–1989 | ||
| 1989–1999 | Nordbanen | ||
| 1999–2007 | as above except all stops until Hellerup | ||
| 2007–2009 | Hareskovbanen
| ||
| all stops to Hundige; some daytime trains to Solrød Strand | Dec 2009–2014 | ||
| 2014– | Nordbanen non-stop Hellerup-Jægersborg, all stops to Hillerød |
Until 2007, separate service designations were used for trains that reinforced the basic service on the Køge radial in high-traffic periods. This was in part because they had their own stopping patterns, and in part due to the then-current doctrine that a service letter such as A must not be used for more than exactly 3 trains an hour. The first supplementary service was the rush-hour Ax which started running when the first phase of the Køge radial opened in 1972. It was upgraded to the daytime K service in 1992 and quickly renamed to A+ in 1993.
| Name | Southern end | Years | Northern end |
|---|---|---|---|
| Ax | Køgebugtbanen
| 1972–1976 | terminated at Hellerup |
| all stops to Hundige | 1976–1979 | ||
| to Hundige but stopping where? | 1979–1983 | terminated at Hellerup or Østerport? | |
| to Hundige, non-stop København H - Friheden | 1983–1992 | terminated at Østerport | |
| K | 1992–1993 | ||
| A+ | 1993–1995 | ||
| to Køge, non-stop København H - Sjælør - Friheden | 1995–1998 | ||
| as above, plus stop at Sydhavn | 1998–2002 | ||
| as above, plus stop at Dybbølsbro | 2002–2005 | ||
| 2006–2007 | Hareskovbanen
| ||
| Joined into A from September 2007 |