On the Central line, steam locomotives were still operating between Greenford and West Ruislip in the west and between Leytonstone and Ongar in the east. Electrification to West Ruislip was completed in 1948, leading to the start of passenger trains, which did not require locomotive changes, on 21 November of that year. On the same day, electrification round the Fairlop loop in the east was completed. And from 25 September 1949, electric tube trains were in operation between Loughton and Epping. This left a steam shuttle service operating between Epping and Ongar, which was not electrified until 18 November 1957. New trains were introduced on the line in 1959.