The Churchbury Loop from Bury Street Junction, near Enfield, and Cheshunt, had been dormant so far as passenger use was concerned, since 1909. In 1960 it was electrified and reopened as part of a new electrified suburban network; the line was retitled the Southbury Loop. At first six trains an hour were run, although this was later reduced. The new suburban electric trains ran as far as Bishop's Stortford and Hertford. For the time being the southern part of the N&ER route remained unelectrified, but electrification was provided from May 1969.