From the Wikipedia page [1] The Metropolitan Electric Tramways Company Limited operated electric tram services in suburban areas of Middlesex and Hertfordshire from 1904 to 1933, when its services passed to the London Passenger Transport Board. The first section of line was opened on 22 July 1904 with services from Finsbury Park to Manor House (where a connection with the London County Council Tramways was made) and Wood Green. On 3 December a separate section from Cricklewood to Edgware via Hendon opened.