1960s when capacity on the central S-train section became a limiting factor for service extensions on the western radials. The steam trains had poor acceleration relative to the S-trains and therefore tied up the tracks for twice as long as an S-train would. In order to free this capacity the line from Holte to Hillerød was electrified in 1968 and the steam trains replaced by S-trains. The first-class cars were declassified to second class in 1972. Likewise, the Hillerød trains kept the stopping pattern of the steam trains and ran non-stop all the way from Østerport to Holte. Only from 1989 did this tradition break down, and the Hillerød services gradually gained intermediate stops at Hellerup (1989) and Lyngby (1991), and finally (1995) at all stations between Østerport and Hellerup. S-train (Copenhagen) lines